Commit Graph

1757 Commits

Author SHA1 Message Date
Ming Lei d28d3882bd firmware loader: sync firmware cache by async_synchronize_full_domain
async.c has provided synchronization mechanism on async_schedule_*,
so use async_synchronize_full_domain to sync caching firmware instead
of reinventing the wheel.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-22 08:37:18 -07:00
Ming Lei 746058f430 firmware loader: let direct loading back on 'firmware_buf'
Firstly 'firmware_buf' is introduced to make all loading requests
to share one firmware kernel buffer, so firmware_buf should
be used in direct loading for saving memory and speedup firmware
loading.

Secondly, the commit below

	abb139e75c2cdbb955e840d6331cb5863e409d0e(firmware:teach
	the kernel to load firmware files directly from the filesystem)

introduces direct loading for fixing udev regression, but it
bypasses the firmware cache meachnism, so this patch enables
caching firmware for direct loading case since it is still needed
to solve drivers' dependency during system resume.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-22 08:37:17 -07:00
Ming Lei 253c9240ee firmware loader: fix one reqeust_firmware race
Several loading requests may be pending on one same
firmware buf, and this patch moves fw_map_pages_buf()
before complete_all(&fw_buf->completion) and let all
requests see the mapped 'buf->data' once the loading
is completed.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-22 08:37:17 -07:00
Ming Lei 373304fe10 firmware loader: cancel uncache work before caching firmware
Under 'Opportunistic sleep' situation, system sleep might be
triggered very frequently, so the uncahce work may not be completed
before caching firmware during next suspend.

This patch cancels the uncache work before caching firmware to
fix the problem above.

Also this patch optimizes the cacheing firmware mechanism a bit by
only storing one firmware cache entry for one firmware image.

So if the firmware is still cached during suspend, it doesn't need
to be loaded from user space any more.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-22 08:37:16 -07:00
Dong Aisheng 5784ee4dcb regmap: select REGMAP if REGMAP_MMIO and REGMAP_IRQ enabled
The regmap_mmio and regmap_irq depend on regmap core, if not select,
we may not compile regmap core and meet compiling errors as follows
if REGMAP_MMIO is selected by client drivers:
drivers/mfd/syscon.c:94:15: error: variable 'syscon_regmap_config' has initializer but incomplete type
drivers/mfd/syscon.c:95:2: error: unknown field 'reg_bits' specified in initializer
drivers/mfd/syscon.c:95:2: warning: excess elements in struct initializer [enabled by default]
drivers/mfd/syscon.c:95:2: warning: (near initialization for 'syscon_regmap_config') [enabled by default]
drivers/mfd/syscon.c:96:2: error: unknown field 'val_bits' specified in initializer
drivers/mfd/syscon.c:96:2: warning: excess elements in struct initializer [enabled by default]
drivers/mfd/syscon.c:96:2: warning: (near initialization for 'syscon_regmap_config') [enabled by default]
drivers/mfd/syscon.c:97:2: error: unknown field 'reg_stride' specified in initializer
drivers/mfd/syscon.c:97:2: warning: excess elements in struct initializer [enabled by default]
drivers/mfd/syscon.c:97:2: warning: (near initialization for 'syscon_regmap_config') [enabled by default]
drivers/mfd/syscon.c: In function 'syscon_probe':
drivers/mfd/syscon.c:124:2: error: invalid use of undefined type 'struct regmap_config'
drivers/mfd/syscon.c:125:2: error: implicit declaration of function 'devm_regmap_init_mmio' [-Werror=implicit-function-declaration]
drivers/mfd/syscon.c:125:17: warning: assignment makes pointer from integer without a cast [enabled by default]
cc1: some warnings being treated as errors

drivers/mfd/Kconfig:
config MFD_SYSCON
        bool "System Controller Register R/W Based on Regmap"
	depends on OF
	select REGMAP_MMIO
	help
	  Select this option to enable accessing system control registers
	    via regmap.

Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-17 22:09:35 +09:00
Davide Ciminaghi 0d4529c534 regmap: make lock/unlock functions customizable
It is sometimes convenient for a regmap user to override the standard
regmap lock/unlock functions with custom functions.
For instance this can be useful in case an already existing spinlock
or mutex has to be used for locking a set of registers instead of the
internal regmap spinlock/mutex.
Note that the fast_io field of struct regmap_bus is ignored in case
custom locking functions are used.

Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-17 16:52:02 +09:00
Paul Bolle a8f28cfad8 regmap: silence GCC warning
Building regmap.o triggers this GCC warning:
    drivers/base/regmap/regmap.c: In function ‘regmap_raw_read’:
    drivers/base/regmap/regmap.c:1172:6: warning: ‘ret’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Long story short: Jakub Jelinek pointed out that there is a type
mismatch between 'num' in regmap_volatile_range() and 'val_count' in
regmap_raw_read(). And indeed, converting 'num' to the type of
'val_count' (ie, size_t) makes this warning go away.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 10:03:19 +09:00
Mark Brown 8a2ceac661 regmap: Split raw writes that cross window boundaries
If a block write covers a paged memory region and crosses a window
boundary then rather than failing the write split the transfer up
into multiple writes, making the whole process more transparent for
drivers.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 10:00:00 +09:00
Mark Brown 0ff3e62ff1 regmap: Make return code checks consistent
The range code was written to check for return codes less than zero as
errors but throughout the rest of the API return codes not equal to zero
are errors. Change all these checks to match the house style.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 10:00:00 +09:00
Mark Brown 98bc7dfd76 regmap: Factor range lookup out of page selection
This will support a subsequent update to allow bulk writes to cross window
boundaries.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 10:00:00 +09:00
Mark Brown 4b020b3f9b regmap: Provide debugfs read of register ranges
If a register range is named then provide a debugfs file showing the
contents of the range separately.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:59:59 +09:00
Mark Brown bd9cc12f4a regmap: Factor out debugfs register read
This will allow the use of the same code for reading register ranges.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:59:59 +09:00
Mark Brown d058bb4961 regmap: Allow ranges to be named
For more useful diagnostics.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:59:59 +09:00
Mark Brown 061adc064a regmap: When we sanity check during range adds say what errors we find
Rather than just returning a single error code for every possible thing we
can notice print an error message saying what the problem was. This makes
it very much easier to figure out what's wrong and fix it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:59:59 +09:00
Mark Brown e3549cd013 regmap: Rename n_ranges to num_ranges
This makes things consistent with the rest of the API and is actually what
the documentation says. We don't currently have any in tree users so low
cost.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:59:59 +09:00
Mark Brown 90f790d2dc regmap: irq: Allow users to retrieve the irq_domain
This is useful for integration with other subsystems, especially MFD,
and provides an alternative API for users that request their own IRQs.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-10-15 09:49:23 +09:00
Wen Congyang e90bdb7f52 memory-hotplug: update memory block's state and notify userspace
remove_memory() will be called when hot removing a memory device.  But
even if offlining memory, we cannot notice it.  So the patch updates the
memory block's state and sends notification to userspace.

Additionally, the memory device may contain more than one memory block.
If the memory block has been offlined, __offline_pages() will fail.  So we
should try to offline one memory block at a time.

Thus remove_memory() also check each memory block's state.  So there is no
need to check the memory block's state before calling remove_memory().

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 16:23:02 +09:00
Wen Congyang a16cee10c7 memory-hotplug: preparation to notify memory block's state at memory hot remove
remove_memory() is called in two cases:
1. echo offline >/sys/devices/system/memory/memoryXX/state
2. hot remove a memory device

In the 1st case, the memory block's state is changed and the notification
that memory block's state changed is sent to userland after calling
remove_memory().  So user can notice memory block is changed.

But in the 2nd case, the memory block's state is not changed and the
notification is not also sent to userspcae even if calling
remove_memory().  So user cannot notice memory block is changed.

For adding the notification at memory hot remove, the patch just prepare
as follows:
1st case uses offline_pages() for offlining memory.
2nd case uses remove_memory() for offlining memory and changing memory block's
    state and notifing the information.

The patch does not implement notification to remove_memory().

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 16:23:02 +09:00
Linus Torvalds ce57e981f2 firmware: use 'kernel_read()' to read firmware into kernel buffer
Fengguang correctly points out that the firmware reading should not use
vfs_read(), since the buffer is in kernel space.

The vfs_read() just happened to work for kernel threads, but sparse
warns about the incorrect address spaces, and it's definitely incorrect
and could fail for other users of the firmware loading.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-04 09:19:02 -07:00
Linus Torvalds abb139e75c firmware: teach the kernel to load firmware files directly from the filesystem
This is a first step in allowing people to by-pass udev for loading
device firmware.  Current versions of udev will deadlock (causing us to
block for the 30 second timeout) under some circumstances if the
firmware is loaded as part of the module initialization path, and this
is causing problems for media drivers in particular.

The current patch hardcodes the firmware path that udev uses by default,
and will fall back to the legacy udev mode if the firmware cannot be
found there.  We'd like to add support for both configuring the paths
and the fallback behaviour, but in the meantime this hopefully fixes the
immediate problem, while also giving us a way forward.

[ v2: Some VFS layer interface cleanups suggested by Al Viro ]
[ v3: use the default udev paths suggested by Kay Sievers ]

Suggested-by: Ivan Kalvachev <ikalvachev@gmail.com>
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Kay Sievers <kay@redhat.com>
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-03 15:58:32 -07:00
Linus Torvalds aab174f0df Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs update from Al Viro:

 - big one - consolidation of descriptor-related logics; almost all of
   that is moved to fs/file.c

   (BTW, I'm seriously tempted to rename the result to fd.c.  As it is,
   we have a situation when file_table.c is about handling of struct
   file and file.c is about handling of descriptor tables; the reasons
   are historical - file_table.c used to be about a static array of
   struct file we used to have way back).

   A lot of stray ends got cleaned up and converted to saner primitives,
   disgusting mess in android/binder.c is still disgusting, but at least
   doesn't poke so much in descriptor table guts anymore.  A bunch of
   relatively minor races got fixed in process, plus an ext4 struct file
   leak.

 - related thing - fget_light() partially unuglified; see fdget() in
   there (and yes, it generates the code as good as we used to have).

 - also related - bits of Cyrill's procfs stuff that got entangled into
   that work; _not_ all of it, just the initial move to fs/proc/fd.c and
   switch of fdinfo to seq_file.

 - Alex's fs/coredump.c spiltoff - the same story, had been easier to
   take that commit than mess with conflicts.  The rest is a separate
   pile, this was just a mechanical code movement.

 - a few misc patches all over the place.  Not all for this cycle,
   there'll be more (and quite a few currently sit in akpm's tree)."

Fix up trivial conflicts in the android binder driver, and some fairly
simple conflicts due to two different changes to the sock_alloc_file()
interface ("take descriptor handling from sock_alloc_file() to callers"
vs "net: Providing protocol type via system.sockprotoname xattr of
/proc/PID/fd entries" adding a dentry name to the socket)

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits)
  MAX_LFS_FILESIZE should be a loff_t
  compat: fs: Generic compat_sys_sendfile implementation
  fs: push rcu_barrier() from deactivate_locked_super() to filesystems
  btrfs: reada_extent doesn't need kref for refcount
  coredump: move core dump functionality into its own file
  coredump: prevent double-free on an error path in core dumper
  usb/gadget: fix misannotations
  fcntl: fix misannotations
  ceph: don't abuse d_delete() on failure exits
  hypfs: ->d_parent is never NULL or negative
  vfs: delete surplus inode NULL check
  switch simple cases of fget_light to fdget
  new helpers: fdget()/fdput()
  switch o2hb_region_dev_write() to fget_light()
  proc_map_files_readdir(): don't bother with grabbing files
  make get_file() return its argument
  vhost_set_vring(): turn pollstart/pollstop into bool
  switch prctl_set_mm_exe_file() to fget_light()
  switch xfs_find_handle() to fget_light()
  switch xfs_swapext() to fget_light()
  ...
2012-10-02 20:25:04 -07:00
Linus Torvalds ca41cc96b2 Merge branch 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull CMA and DMA-mapping updates from Marek Szyprowski:
 "This time the pull request is rather small, because the further
  redesign patches were not ready on time.

  This pull request consists of the patches which extend ARM DMA-mapping
  subsystem with support for CPU coherent (ACP) DMA busses.  The first
  client of the new version is HighBank SATA driver.  The second part of
  the pull request includes various cleanup for both CMA common code and
  ARM DMA-mapping subsystem."

Fix up trivial add-add conflict due to the "dma-coherent" DT property
being added next to the "calxeda,port-phys" property for the Calxeda
AHCI controller.

* 'for-v3.7' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  ARM: dma-mapping: Remove unsed var at arm_coherent_iommu_unmap_page
  ARM: highbank: add coherent DMA setup
  ARM: kill off arch_is_coherent
  ARM: add coherent iommu dma ops
  ARM: add coherent dma ops
  ARM: dma-mapping: Refrain noisy console message
  ARM: dma-mapping: Small logical clean up
  drivers: dma-contiguous: refactor dma_alloc_from_contiguous()
2012-10-02 19:13:12 -07:00
Linus Torvalds 16642a2e7b Power management updates for 3.7-rc1
* Improved system suspend/resume and runtime PM handling for the SH TMU, CMT
   and MTU2 clock event devices (also used by ARM/shmobile).
 
 * Generic PM domains framework extensions related to cpuidle support and
   domain objects lookup using names.
 
 * ARM/shmobile power management updates including improved support for the
   SH7372's A4S power domain containing the CPU core.
 
 * cpufreq changes related to AMD CPUs support from Matthew Garrett, Andre
   Przywara and Borislav Petkov.
 
 * cpu0 cpufreq driver from Shawn Guo.
 
 * cpufreq governor fixes related to the relaxing of limit from Michal Pecio.
 
 * OMAP cpufreq updates from Axel Lin and Richard Zhao.
 
 * cpuidle ladder governor fixes related to the disabling of states from
   Carsten Emde and me.
 
 * Runtime PM core updates related to the interactions with the system suspend
   core from Alan Stern and Kevin Hilman.
 
 * Wakeup sources modification allowing more helper functions to be called from
   interrupt context from John Stultz and additional diagnostic code from Todd
   Poynor.
 
 * System suspend error code path fix from Feng Hong.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iQIcBAABAgAGBQJQa1rRAAoJEKhOf7ml8uNsYZ0P/2RZ71sgLWcUCfr0yHaiZeOd
 2GxEYSZ+9BZJHADgoAK/bHRTv8crm40Y2RkbaWbxPDRNuE4SutbvNTGTlJSAguSD
 yHkU/6AFC7u8Jwq+afsWIdGX7eHd78zPpj6EVtVtjHM903WDwbMU2vUz7tQ+fFa+
 ZZ7eydq9j0ec0OoH3UeNhet7JSOpT5BSLgjmIkHMBgIvTxNVDbkB31QUxnUxocxn
 k6S2wQaUSJJWGMLksRRNrhwLq+cGYwTsaOtG/KzRLH1raUyn33B5pcZr0aqhOkjg
 ClaCks3V8o3vRghSwOPB5aVXzjBKvM3UnSyJNIl+FeCeyWuwSNbkEFdA/e7oPuxG
 UsW6dcHiuVo6Ir4+zhd9+lN+/AcPTChO5b7lbU8qRF4ce04czWlUY/KzJjaM+YOE
 CKGq6eX9AHwFjE+h4+VcCXgmzcioiS8Y/CPz13u8N1y0zzwW+ftjb12K+7lVBEG1
 fhrePKHgLw3kJ9LqGpR+4vVur7C+rCf6WwCReTY2vXXVYJ+SuKWTRI4zAjTPXtHa
 i9dpMRASpF+ScRYBcgwIpv789WuHATFKqdBSinZUKBaxQZ5flJ2qIrfqN5VeAejh
 oQs/zZCdIuAtFKqVycQ0L42YxFNKgPFKQErUCSu3M5OuZLlLVLu7yQvIo2Xmo9qf
 Hcrpvo5K+w29YkiwGP9e
 =rbCk
 -----END PGP SIGNATURE-----

Merge tag 'pm-for-3.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael J Wysocki:

 - Improved system suspend/resume and runtime PM handling for the SH
   TMU, CMT and MTU2 clock event devices (also used by ARM/shmobile).

 - Generic PM domains framework extensions related to cpuidle support
   and domain objects lookup using names.

 - ARM/shmobile power management updates including improved support for
   the SH7372's A4S power domain containing the CPU core.

 - cpufreq changes related to AMD CPUs support from Matthew Garrett,
   Andre Przywara and Borislav Petkov.

 - cpu0 cpufreq driver from Shawn Guo.

 - cpufreq governor fixes related to the relaxing of limit from Michal
   Pecio.

 - OMAP cpufreq updates from Axel Lin and Richard Zhao.

 - cpuidle ladder governor fixes related to the disabling of states from
   Carsten Emde and me.

 - Runtime PM core updates related to the interactions with the system
   suspend core from Alan Stern and Kevin Hilman.

 - Wakeup sources modification allowing more helper functions to be
   called from interrupt context from John Stultz and additional
   diagnostic code from Todd Poynor.

 - System suspend error code path fix from Feng Hong.

Fixed up conflicts in cpufreq/powernow-k8 that stemmed from the
workqueue fixes conflicting fairly badly with the removal of support for
hardware P-state chips.  The changes were independent but somewhat
intertwined.

* tag 'pm-for-3.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits)
  Revert "PM QoS: Use spinlock in the per-device PM QoS constraints code"
  PM / Runtime: let rpm_resume() succeed if RPM_ACTIVE, even when disabled, v2
  cpuidle: rename function name "__cpuidle_register_driver", v2
  cpufreq: OMAP: Check IS_ERR() instead of NULL for omap_device_get_by_hwmod_name
  cpuidle: remove some empty lines
  PM: Prevent runtime suspend during system resume
  PM QoS: Use spinlock in the per-device PM QoS constraints code
  PM / Sleep: use resume event when call dpm_resume_early
  cpuidle / ACPI : move cpuidle_device field out of the acpi_processor_power structure
  ACPI / processor: remove pointless variable initialization
  ACPI / processor: remove unused function parameter
  cpufreq: OMAP: remove loops_per_jiffy recalculate for smp
  sections: fix section conflicts in drivers/cpufreq
  cpufreq: conservative: update frequency when limits are relaxed
  cpufreq / ondemand: update frequency when limits are relaxed
  properly __init-annotate pm_sysrq_init()
  cpufreq: Add a generic cpufreq-cpu0 driver
  PM / OPP: Initialize OPP table from device tree
  ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
  cpufreq: Remove support for hardware P-state chips from powernow-k8
  ...
2012-10-02 18:32:35 -07:00
Linus Torvalds 437589a74b Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull user namespace changes from Eric Biederman:
 "This is a mostly modest set of changes to enable basic user namespace
  support.  This allows the code to code to compile with user namespaces
  enabled and removes the assumption there is only the initial user
  namespace.  Everything is converted except for the most complex of the
  filesystems: autofs4, 9p, afs, ceph, cifs, coda, fuse, gfs2, ncpfs,
  nfs, ocfs2 and xfs as those patches need a bit more review.

  The strategy is to push kuid_t and kgid_t values are far down into
  subsystems and filesystems as reasonable.  Leaving the make_kuid and
  from_kuid operations to happen at the edge of userspace, as the values
  come off the disk, and as the values come in from the network.
  Letting compile type incompatible compile errors (present when user
  namespaces are enabled) guide me to find the issues.

  The most tricky areas have been the places where we had an implicit
  union of uid and gid values and were storing them in an unsigned int.
  Those places were converted into explicit unions.  I made certain to
  handle those places with simple trivial patches.

  Out of that work I discovered we have generic interfaces for storing
  quota by projid.  I had never heard of the project identifiers before.
  Adding full user namespace support for project identifiers accounts
  for most of the code size growth in my git tree.

  Ultimately there will be work to relax privlige checks from
  "capable(FOO)" to "ns_capable(user_ns, FOO)" where it is safe allowing
  root in a user names to do those things that today we only forbid to
  non-root users because it will confuse suid root applications.

  While I was pushing kuid_t and kgid_t changes deep into the audit code
  I made a few other cleanups.  I capitalized on the fact we process
  netlink messages in the context of the message sender.  I removed
  usage of NETLINK_CRED, and started directly using current->tty.

  Some of these patches have also made it into maintainer trees, with no
  problems from identical code from different trees showing up in
  linux-next.

  After reading through all of this code I feel like I might be able to
  win a game of kernel trivial pursuit."

Fix up some fairly trivial conflicts in netfilter uid/git logging code.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (107 commits)
  userns: Convert the ufs filesystem to use kuid/kgid where appropriate
  userns: Convert the udf filesystem to use kuid/kgid where appropriate
  userns: Convert ubifs to use kuid/kgid
  userns: Convert squashfs to use kuid/kgid where appropriate
  userns: Convert reiserfs to use kuid and kgid where appropriate
  userns: Convert jfs to use kuid/kgid where appropriate
  userns: Convert jffs2 to use kuid and kgid where appropriate
  userns: Convert hpfs to use kuid and kgid where appropriate
  userns: Convert btrfs to use kuid/kgid where appropriate
  userns: Convert bfs to use kuid/kgid where appropriate
  userns: Convert affs to use kuid/kgid wherwe appropriate
  userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids
  userns: On ia64 deal with current_uid and current_gid being kuid and kgid
  userns: On ppc convert current_uid from a kuid before printing.
  userns: Convert s390 getting uid and gid system calls to use kuid and kgid
  userns: Convert s390 hypfs to use kuid and kgid where appropriate
  userns: Convert binder ipc to use kuids
  userns: Teach security_path_chown to take kuids and kgids
  userns: Add user namespace support to IMA
  userns: Convert EVM to deal with kuids and kgids in it's hmac computation
  ...
2012-10-02 11:11:09 -07:00
Michal Nazarewicz bdd43cb39f drivers: dma-contiguous: refactor dma_alloc_from_contiguous()
The dma_alloc_from_contiguous() function returns either a valid pointer
to a page structure or NULL, the error code set when pageno >= cma->count
is not used at all and can be safely removed.

This commit also changes the function to avoid goto and have only one exit
path and one place where mutex is unlocked.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
[fixed compilation break caused by missing semicolon]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
2012-10-02 08:57:45 +02:00
Linus Torvalds 06d2fe153b Driver core merge for 3.7-rc1
Here is the big driver core update for 3.7-rc1.
 
 A number of firmware_class.c updates (as you saw a month or so ago), and
 some hyper-v updates and some printk fixes as well.  All patches that
 are outside of the drivers/base area have been acked by the respective
 maintainers, and have all been in the linux-next tree for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.19 (GNU/Linux)
 
 iEYEABECAAYFAlBp3vkACgkQMUfUDdst+ylQoACgldktGFgkCLzH+rGYthrXOC5P
 9hUAnjmOhdoHlMTL81vWTlH+BrGernym
 =khrr
 -----END PGP SIGNATURE-----

Merge tag 'driver-core-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core merge from Greg Kroah-Hartman:
 "Here is the big driver core update for 3.7-rc1.

  A number of firmware_class.c updates (as you saw a month or so ago),
  and some hyper-v updates and some printk fixes as well.  All patches
  that are outside of the drivers/base area have been acked by the
  respective maintainers, and have all been in the linux-next tree for a
  while.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'driver-core-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (95 commits)
  memory: tegra{20,30}-mc: Fix reading incorrect register in mc_readl()
  device.h: Add missing inline to #ifndef CONFIG_PRINTK dev_vprintk_emit
  memory: emif: Add ifdef CONFIG_DEBUG_FS guard for emif_debugfs_[init|exit]
  Documentation: Fixes some translation error in Documentation/zh_CN/gpio.txt
  Documentation: Remove 3 byte redundant code at the head of the Documentation/zh_CN/arm/booting
  Documentation: Chinese translation of Documentation/video4linux/omap3isp.txt
  device and dynamic_debug: Use dev_vprintk_emit and dev_printk_emit
  dev: Add dev_vprintk_emit and dev_printk_emit
  netdev_printk/netif_printk: Remove a superfluous logging colon
  netdev_printk/dynamic_netdev_dbg: Directly call printk_emit
  dev_dbg/dynamic_debug: Update to use printk_emit, optimize stack
  driver-core: Shut up dev_dbg_reatelimited() without DEBUG
  tools/hv: Parse /etc/os-release
  tools/hv: Check for read/write errors
  tools/hv: Fix exit() error code
  tools/hv: Fix file handle leak
  Tools: hv: Implement the KVP verb - KVP_OP_GET_IP_INFO
  Tools: hv: Rename the function kvp_get_ip_address()
  Tools: hv: Implement the KVP verb - KVP_OP_SET_IP_INFO
  Tools: hv: Add an example script to configure an interface
  ...
2012-10-01 12:10:44 -07:00
Al Viro cb0942b812 make get_file() return its argument
simplifies a bunch of callers...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-09-26 21:10:25 -04:00
Rafael J. Wysocki b9142167a2 Merge branch 'pm-qos'
* pm-qos:
  Revert "PM QoS: Use spinlock in the per-device PM QoS constraints code"
2012-09-24 21:41:31 +02:00
Rafael J. Wysocki 8376869e51 Revert "PM QoS: Use spinlock in the per-device PM QoS constraints code"
This reverts commit fc2fb3a075.

The problem with the above commit is that it makes the device PM QoS
core code hold a spinlock around blocking_notifier_call_chain()
invocations.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-24 21:39:36 +02:00
Rafael J. Wysocki 057d51a126 Merge branch 'pm-sleep'
* pm-sleep:
  PM: Prevent runtime suspend during system resume
  PM / Sleep: use resume event when call dpm_resume_early

Conflicts:
	drivers/base/power/main.c (trivial)
2012-09-24 13:31:38 +02:00
Rafael J. Wysocki 071f58279f Merge branch 'pm-runtime'
* pm-runtime:
  PM / Runtime: let rpm_resume() succeed if RPM_ACTIVE, even when disabled, v2
2012-09-24 13:30:55 +02:00
Rafael J. Wysocki c26d4114aa Merge branch 'pm-qos'
* pm-qos:
  PM QoS: Use spinlock in the per-device PM QoS constraints code
2012-09-24 13:30:50 +02:00
Kevin Hilman 6f3c77b040 PM / Runtime: let rpm_resume() succeed if RPM_ACTIVE, even when disabled, v2
There are several drivers where the return value of
pm_runtime_get_sync() is used to decide whether or not it is safe to
access hardware and that don't provide .suspend() callbacks for system
suspend (but may use late/noirq callbacks.)  If such a driver happens
to call pm_runtime_get_sync() during system suspend, after the core
has disabled runtime PM, it will get the error code and will decide
that the hardware should not be accessed, although this may be a wrong
conclusion, depending on the state of the device when runtime PM was
disabled.

Drivers might work around this problem by using a test like:

   ret = pm_runtime_get_sync(dev);
   if (!ret || (ret == -EACCES && driver_private_data(dev)->suspended)) {
      /* access hardware */
   }

where driver_private_data(dev)->suspended is a flag set by the
driver's .suspend() method (that would have to be added for this
purpose).  However, that potentially would need to be done by multiple
drivers which means quite a lot of duplicated code and bloat.

To avoid that we can use the observation that the core sets
dev->power.is_suspended before disabling runtime PM and use that
instead of the driver's private flag.  Still, potentially many drivers
would need to repeat that same check in quite a few places, so it's
better to let the core do it.

Then we can be a bit smarter and check whether or not runtime PM was
disabled by the core only (disable_depth == 1) or by someone else in
addition to the core (disable_depth > 1).  In the former case
rpm_resume() can return 1 if the runtime PM status is RPM_ACTIVE,
because it means the device was active when the core disabled runtime
PM.  In the latter case it should still return -EACCES, because it
isn't clear why runtime PM has been disabled.

Tested on AM3730/Beagle-xM where a wakeup IRQ firing during the late
suspend phase triggers runtime PM activity in the I2C driver since the
wakeup IRQ is on an I2C-connected PMIC.

[rjw: Modified whitespace to follow the file's convention.]

Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-22 21:15:08 +02:00
Mark Brown 613dac31a6 Merge remote-tracking branches 'regmap/topic/cache' and 'regmap/topic/irq' into regmap-next 2012-09-22 12:02:05 -04:00
Eric W. Biederman 91fa2ccaa8 userns: Convert devtmpfs to use GLOBAL_ROOT_UID and GLOBAL_ROOT_GID
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-09-21 03:13:05 -07:00
Alan Stern 88d26136a2 PM: Prevent runtime suspend during system resume
This patch (as1591) moves the pm_runtime_get_noresume() and
pm_runtime_put_sync() calls from __device_suspend() and
device_resume() to device_prepare() and device_complete() in the PM
core.

The reason for doing this is to make sure that parent devices remain
at full power (i.e., don't go into runtime suspend) while their
children are being resumed from a system sleep.

The PCI core already contained equivalent code to serve the same
purpose.  The patch removes the duplicated code, since it is no longer
needed.  One of the comments from the PCI core gets moved into the PM
core, and a second comment is added to explain whe the _get_noresume
and _put_sync calls are present.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-19 21:59:02 +02:00
Jean Pihet fc2fb3a075 PM QoS: Use spinlock in the per-device PM QoS constraints code
The per-device PM QoS locking requires a spinlock to be used. The reasons
are:
 - an alignement with the PM QoS core code, which is used by the per-device
   PM QoS code for the constraints lists management. The PM QoS core code
   uses spinlocks to protect the constraints lists,
 - some drivers need to use the per-device PM QoS functionality from
   interrupt context or spinlock protected context.
   An example of such a driver is the OMAP HSI (high-speed synchronous serial
   interface) driver which needs to control the IP block idle state
   depending on the FIFO empty state, from interrupt context.

Reported-by: Djamil Elaidi <d-elaidi@ti.com>
Signed-off-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-19 14:17:20 +02:00
Feng Hong 997a031107 PM / Sleep: use resume event when call dpm_resume_early
When dpm_suspend_noirq fail, state is PMSG_SUSPEND,
should change to PMSG_RESUME when dpm_resume_early is called

Signed-off-by: Feng Hong <hongfeng@marvell.com>
Signed-off-by: Raul Xiong <xjian@marvell.com>
Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-19 14:16:00 +02:00
Rafael J. Wysocki fa373abbbd Merge branch 'pm-cpufreq'
* pm-cpufreq:
  cpufreq: OMAP: remove loops_per_jiffy recalculate for smp
  sections: fix section conflicts in drivers/cpufreq
  cpufreq: conservative: update frequency when limits are relaxed
  cpufreq / ondemand: update frequency when limits are relaxed
  cpufreq: Add a generic cpufreq-cpu0 driver
  PM / OPP: Initialize OPP table from device tree
  ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
  cpufreq: Remove support for hardware P-state chips from powernow-k8
  acpi-cpufreq: Add compatibility for legacy AMD cpb sysfs knob
  acpi-cpufreq: Add support for disabling dynamic overclocking
  ACPI: Add fixups for AMD P-state figures
  powernow-k8: delay info messages until initialization has succeeded
  cpufreq: Add warning message to powernow-k8
  acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs
  acpi-cpufreq: Add support for modern AMD CPUs
  cpufreq / powernow-k8: Fixup missing _PSS objects message
  PM / cpufreq: Initialise the cpu field during conservative governor start
2012-09-17 20:26:02 +02:00
Rafael J. Wysocki d6a56ae7ac Merge branch 'pm-sleep'
* pm-sleep:
  properly __init-annotate pm_sysrq_init()
  PM / wakeup: Use irqsave/irqrestore for events_lock
  PM / Freezer: Fix small typo "regrigerator"
  PM / Sleep: Print name of wakeup source that aborts suspend
2012-09-17 20:25:38 +02:00
Rafael J. Wysocki 079d364b04 Merge branch 'pm-domains'
* pm-domains:
  PM / Domains: Fix compilation warning related to genpd_start_dev_no_timing()
  PM / Domains: Operations related to cpuidle using domain names
  PM / Domains: Document cpuidle-related functions and change their names
  PM / Domains: Add power-on function using names to identify domains
  PM / Domains: Make it possible to use names when adding subdomains
  PM / Domains: Make it possible to use domain names when adding devices
2012-09-17 20:25:33 +02:00
Rafael J. Wysocki 00e8b26133 Merge branch 'pm-timers'
* pm-timers:
  PM: Do not use the syscore flag for runtime PM
  sh: MTU2: Basic runtime PM support
  sh: CMT: Basic runtime PM support
  sh: TMU: Basic runtime PM support
  PM / Domains: Do not measure start time for "irq safe" devices
  PM / Domains: Move syscore flag from subsys data to struct device
  PM / Domains: Rename the always_on device flag to syscore
  PM / Runtime: Allow helpers to be called by early platform drivers
  PM: Reorganize device PM initialization
  sh: MTU2: Introduce clock events suspend/resume routines
  sh: CMT: Introduce clocksource/clock events suspend/resume routines
  sh: TMU: Introduce clocksource/clock events suspend/resume routines
  timekeeping: Add suspend and resume of clock event devices
  PM / Domains: Add power off/on function for system core suspend stage
  PM / Domains: Introduce simplified power on routine for system resume
2012-09-17 20:25:18 +02:00
Joe Perches 666f355f38 device and dynamic_debug: Use dev_vprintk_emit and dev_printk_emit
Convert direct calls of vprintk_emit and printk_emit to the
dev_ equivalents.

Make create_syslog_header static.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-17 06:10:05 -07:00
Joe Perches 05e4e5b87a dev: Add dev_vprintk_emit and dev_printk_emit
Add utility functions to consolidate the use of
create_syslog_header and vprintk_emit.

This allows conversion of logging functions that
call create_syslog_header and then call vprintk_emit
or printk_emit to the dev_ equivalents.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-17 06:10:05 -07:00
Joe Perches 798efc60e4 dev_dbg/dynamic_debug: Update to use printk_emit, optimize stack
commit c4e00daaa9
("driver-core: extend dev_printk() to pass structured data")
changed __dev_printk and broke dynamic-debug's ability to control the
dynamic prefix of dev_dbg(dev,..).

commit af7f2158fd
("drivers-core: make structured logging play nice with dynamic-debug")
made a minimal correction.

The current dynamic debug code uses up to 3 recursion levels via %pV.
This can consume quite a bit of stack.  Directly call printk_emit to
reduce the recursion depth.

These changes include:

dev_dbg:
o Create and use function create_syslog_header to format the syslog
  header for printk_emit uses.
o Call create_syslog_header and neaten __dev_printk
o Make __dev_printk static not global
o Remove include header declaration of __dev_printk
o Remove now unused EXPORT_SYMBOL() of __dev_printk
o Whitespace neatening

dynamic_dev_dbg:
o Remove KERN_DEBUG from dynamic_emit_prefix
o Call create_syslog_header and printk_emit
o Whitespace neatening

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-17 06:08:30 -07:00
Greg Kroah-Hartman 8f949b9a7e Merge 3.6-rc7 into driver-core-next
This pulls in the fixes in that branch that are needed here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-16 16:51:27 -07:00
Ming Lei cfe016b14e firmware loader: fix compile warning when CONFIG_PM=n
This patch replaces the previous macro of CONFIG_PM with
CONFIG_PM_SLEEP becasue firmware cache is only used in
system sleep situations.

Also this patch fixes the below compile warning when
CONFIG_PM=n:

	drivers/base/firmware_class.c:1147: warning: 'device_cache_fw_images'
	defined but not used
	drivers/base/firmware_class.c:1212: warning:
	'device_uncache_fw_images_delay' defined but not used

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10 16:40:30 -07:00
Shawn Guo b496dfbc94 PM / OPP: Initialize OPP table from device tree
With a lot of devices booting from device tree nowadays, it requires
that OPP table can be initialized from device tree.  The patch adds
a helper function of_init_opp_table together with a binding doc for
that purpose.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-09 22:06:33 +02:00
Yunfan Zhang 8138073951 regmap: no need primary handler for nested irq
The primary handler will NOT be called if the interrupt nests into
another interrupt thread. Remove it to avoid confusing.

Signed-off-by: Yunfan Zhang <yfzhang@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-09-09 11:05:45 +08:00
Ming Lei ac39b3ea73 firmware loader: let caching firmware piggyback on loading firmware
After starting caching firmware, there is still some time left
before devices are suspended, during the period, request_firmware
or its nowait version may still be triggered by the below situations
to load firmware images which can't be cached during suspend/resume
cycle.

	- new devices added
	- driver bind
	- or device open kind of things

This patch utilizes the piggyback trick to cache firmware for
this kind of situation: just increase the firmware buf's reference
count and add the fw name entry into cache entry list after starting
caching firmware and before syscore_suspend() is called.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-06 14:46:16 -07:00
Ming Lei ef40bb1bd0 firmware loader: fix firmware -ENOENT situations
If the requested firmware image doesn't exist, firmware->priv
should be set for the later concurrent requests, otherwise
warning and oops will be triggered inside firmware_free_data().

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-06 14:46:16 -07:00
John Stultz 4955070974 PM / wakeup: Use irqsave/irqrestore for events_lock
Jon Medhurst (Tixy) recently noticed a problem with the
events_lock usage. One of the Android patches that uses
wakeup_sources calls wakeup_source_add() with irqs disabled.
However, the event_lock usage in wakeup_source_add() uses
spin_lock_irq()/spin_unlock_irq(), which reenables interrupts.
This results in lockdep warnings.

The fix is to use spin_lock_irqsave()/spin_lock_irqrestore()
instead for the events_lock.

References: https://bugs.launchpad.net/linaro-landing-team-arm/+bug/1037565
Reported-and-debugged-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-06 23:19:06 +02:00
Sachin Kamat b3d3b9fb60 PM / Domains: Fix compilation warning related to genpd_start_dev_no_timing()
Function genpd_start_dev_no_timing was accessed inside CONFIG_PM_RUNTIME
macro but defined outside it. When the above macro was not defined the
compiler gave the following warning:

drivers/base/power/domain.c:96:12: warning:
‘genpd_start_dev_no_timing’ defined but not used [-Wunused-function]

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-06 23:10:53 +02:00
Peter Ujfalusi 1b8cb92906 driver core: Check if r->name is valid in platform_get_resource_byname()
Safety check for the validity of the resource name before calling strcmp().
If the resource name is NULL do not compare it, just skip it.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-06 13:29:11 -07:00
Rafael J. Wysocki 74a2799ab5 PM / Domains: Operations related to cpuidle using domain names
Make it possible to use domain names in operations connecting cpuidle
to and disconnecting it from a PM domain.  This is useful on
platforms where PM domain objects are organized in such a way that
the names of the domains are easier to use than the addresses of
those objects.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:53 +02:00
Rafael J. Wysocki 40114447a7 PM / Domains: Document cpuidle-related functions and change their names
The names of the cpuidle-related functions in
drivers/base/power/domain.c are inconsistent with the names of the
other exported functions in that file (the "pm_" prefix is missing
from them) and they are missing kerneldoc comments.

Fix that by adding the missing "pm_" prefix to the names of those
functions and add kerneldoc comments documenting them.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:53 +02:00
Rafael J. Wysocki 8bc0251de2 PM / Domains: Add power-on function using names to identify domains
It sometimes is necessary to turn on a given PM domain when only
the name of it is known and the domain pointer is not readily
available.  For this reason, add a new helper function,
pm_genpd_name_poweron(), allowing the caller to turn on a PM domain
using its name for identification.  To avoid code duplication,
move the domain lookup code to a separate function.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:53 +02:00
Rafael J. Wysocki fb7268be9f PM / Domains: Make it possible to use names when adding subdomains
Add a new helper function, pm_genpd_add_subdomain_names(), allowing
the caller to add a subdomain to a generic PM domain using names for
domain identification (both domains have to be initialized before).

This function is useful for adding subdomains to PM domains whose
representations are stored in tables, when the caller doesn't know
the indices of the domain to add the subdomain to and of the
subdomain itself, but it knows the domains' names.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:52 +02:00
Rafael J. Wysocki b5abb085f5 PM / Domains: Make it possible to use domain names when adding devices
Add a new helper function __pm_genpd_name_add_device() allowing
a device to be added to a (registered) generic PM domain identified
by name.  Add a wrapper around it, pm_genpd_name_add_device(),
passing NULL as the last argument and reorganize pm_domains.h for the
new functions to be defined consistently with the existing ones.

These functions are useful for adding devices to PM domains whose
representations are stored in tables, when the caller doesn't know
the index of the domain to add the device to, but it knows the
domain's name.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:52 +02:00
Rafael J. Wysocki feb70af0e3 PM: Do not use the syscore flag for runtime PM
The syscore device PM flag used to mark the devices (belonging to
PM domains) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages, need not be
accessed by the runtime PM core functions, because all of the devices
it is set for need to be marked as "irq safe" anyway and are
protected from being turned off by runtime PM by ensuring that their
usage counters are always set.

For this reason, make the syscore flag system-wide PM-specific
and simplify the code used for manipulating it, because it need not
acquire the device's power.lock any more.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:05 +02:00
Rafael J. Wysocki e2e3e4e51e PM / Domains: Do not measure start time for "irq safe" devices
The genpd_start_dev() routine used by pm_genpd_runtime_resume()
to put "irq safe" devices into the full power state measures the
time necessary to "start" the device and updates its PM QoS timing
data if necessary.  This may lead to a deadlock if the given device
is a clock source and genpd_start_dev() is invoked from within the
clock source's .enable() routine, which will happen if that routine
uses pm_runtime_get_sync(), for example, to ensure that the device
is operational.

For this reason, introduce a special routine analogous to
genpd_start_dev(), called genpd_start_dev_no_timing(), that doesn't
carry out the time measurement, and make pm_genpd_runtime_resume()
use it instead of genpd_start_dev() to power up "irq safe" devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:04 +02:00
Rafael J. Wysocki dbf374142d PM / Domains: Move syscore flag from subsys data to struct device
The syscore device PM flag is used to mark the devices (belonging to
a PM domain) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages.  That flag is
stored in the device's struct pm_subsys_data object whose address is
available from struct device.  However, in some situations it may be
convenient to set that flag before the device is added to a PM
domain, so it is better to move it directly to the "power" member of
struct device.  Then, it can be checked by the routines in
drivers/base/power/runtime.c and drivers/base/power/main.c, which is
more straightforward.

This also reduces the number of dev_gpd_data() invocations in the
generic PM domains framework, so the overhead related to the syscore
flag is slightly smaller.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
2012-09-04 01:36:04 +02:00
Rafael J. Wysocki 6fb28badf2 PM / Domains: Rename the always_on device flag to syscore
The always_on device flag is used to mark the devices (belonging to
a PM domain) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages.  Change name
of that flag to "syscore" to better reflect its purpose.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>
2012-09-04 01:36:03 +02:00
Rafael J. Wysocki bed2b42d9f PM / Runtime: Allow helpers to be called by early platform drivers
Runtime PM helper functions, like pm_runtime_get_sync(), cannot be
called by early platform device drivers, because the devices' power
management locks are not initialized at that time.  This is quite
inconvenient, so modify early_platform_add_devices() to initialize
the devices power management locks as appropriate and make sure that
they won't be initialized more than once if an early platform
device is going to be used as a regular one later.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:03 +02:00
Rafael J. Wysocki e91c11b1a7 PM: Reorganize device PM initialization
Make the device power management initialization more straightforward
by moving the initialization of common (i.e. used by both runtime PM
and system suspend) fields to a separate routine.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:03 +02:00
Rafael J. Wysocki 77f827de07 PM / Domains: Add power off/on function for system core suspend stage
Introduce function pm_genpd_syscore_switch() and two wrappers around
it, pm_genpd_syscore_poweroff() and pm_genpd_syscore_poweron(),
allowing the callers to let the generic PM domains framework know
that the given device is not necessary any more and its PM domain
can be turned off (the former) or that the given device will be
required immediately, so its PM domain has to be turned on (the
latter) during the system core (syscore) stage of system suspend
(or hibernation) and resume.

These functions will be used for handling devices registered as
clock sources and clock event devices that belong to PM domains.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:01 +02:00
Rafael J. Wysocki 802d8b49a7 PM / Domains: Introduce simplified power on routine for system resume
Introduce function pm_genpd_sync_poweron() for restoring domain power
during resume from system suspend and hibernation.  It can be much
simpler than pm_genpd_poweron(), because it doesn't have to care
about locking and it can skip many checks done by the latter.

Modify pm_genpd_resume_noirq() and pm_genpd_restore_noirq() to use
the new function.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-09-04 01:36:00 +02:00
Xiaofan Tian 36ac914ba2 regmap: irq: Add mask invert flag for enable register
Currently, regmap will write 1 to mask_base to mask
an interrupt and write 0 to unmask it.

But some chips do not have an interrupt mask register,
and only have interrupt enable register.
Then we should write 0 to disable interrupt and 1 to enable.

So add an mask_invert flag to handle this.
If it is not set, behavior is same as previous.
If set it to 1, the mask value will be inverted
before written to mask_base

Signed-off-by: Xiaofan Tian <tianxf@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-30 11:13:41 -07:00
Marek Szyprowski 7ce9bf1f47 mm: cma: fix alignment requirements for contiguous regions
Contiguous Memory Allocator requires each of its regions to be aligned
in such a way that it is possible to change migration type for all
pageblocks holding it and then isolate page of largest possible order from
the buddy allocator (which is MAX_ORDER-1). This patch relaxes alignment
requirements by one order, because MAX_ORDER alignment is not really
needed.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
2012-08-28 21:01:01 +02:00
Greg Kroah-Hartman 9db48aaf18 Merge 3.6-rc3 into driver-core-next
This picks up the printk fixes in 3.6-rc3 that are needed in this branch.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-27 07:08:39 -07:00
Linus Torvalds c3e2f79d2d dmesg fix for 3.6-rc3
Here is one fix for the dmesg line corruption problem that the previous
 set of patches caused.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iEYEABECAAYFAlAyh14ACgkQMUfUDdst+yn2RQCbBissjdBqDhaX9schGTKyrxPM
 UOUAn3o3KZpUzFWSGYXQGaSI7HtcyElz
 =GWkA
 -----END PGP SIGNATURE-----

Merge tag 'driver-core-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull one more driver core fix from Greg Kroah-Hartman:
 "Here is one fix for the dmesg line corruption problem that the
  previous set of patches caused.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'driver-core-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  dyndbg: fix for SOH in logging messages
2012-08-20 13:13:47 -07:00
Markus Trippelsdorf ebdc82899e dyndbg: fix for SOH in logging messages
commit af7f2158fd was done against master, and clashed with structured
logging's change of KERN_LEVEL to SOH.

Bisected and fixed by Markus Trippelsdorf.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-18 23:40:13 -07:00
Linus Torvalds d9ec0fdc24 Power management fixes for 3.6-rc3
* Fixes for three obscure problems in the runtime PM core code found recently.
 * Two fixes for the new "coupled" cpuidle code from Colin Cross and
   Jon Medhurst.
 * intel_idle driver fix from Konrad Rzeszutek Wilk.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iQIcBAABAgAGBQJQMAOWAAoJEKhOf7ml8uNswp0QAK2pHmZMU8Pg3mY0Qlovvcmn
 KordhSahzwodvdKMpzGqjk/TO3kJ0dk8YGBY1qIzSySmE6S9qsJKQaaoiNR0Se83
 5ZpGVNfJpFBwzrHQkOMkaZzirC5gegKVykM6jlvh3oZqgqGWDawnzOsGCJvYv0lI
 fSAgIc0CDB2dK5V9zFduXp3Cjv2cGEgW/Dd3ggPYns9JZJTAcHuD6cPdSQVml0JG
 vk2VA1IjqRYyn9eSIOerezwh7iVCrAF5miiADXkaTD1fQ9ZyHYfxuqwM1jpijlkz
 PEuICp4FJ4MTPjKYcJgJct0vdc0uD60dvHz9k7PxDIQ35eFiYJYeSU70oNCqULVh
 lhN0VWqUZI1m7U/jH3f/pCc5x4jVhwQvuEE7yIz8d7nclhWqpBElZgyZ8B3yQiR0
 JSChvGtLgYdXYnk6epw4sL6EZpqQW9Xk/JPJpyEy6KAIY45p8q/a972OmGU35ltN
 qAkeBVcAW836NzgnHPJs17R6VzhxFFegd38NbqRvRsVL0Og9+RoT8P9gt2ZPoQ7O
 jBGT/iKn1GzMSTpDGbgj9Nf3tm1zs+pvZ2fc/niBZH/72eyLQVs8zgm0TJVrTA26
 uKeE7l+R3UrsMhBO28kFsX37q3gOYBjtf2K7u2W1q71aNE6YcXdfJfd2aGDZ1LTQ
 1d9MuFjbR6hKQE2Mb7YH
 =fO1w
 -----END PGP SIGNATURE-----

Merge tag 'pm-for-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael J. Wysocki:
  - Fixes for three obscure problems in the runtime PM core code found
   recently.
 - Two fixes for the new "coupled" cpuidle code from Colin Cross and Jon
   Medhurst.
 - intel_idle driver fix from Konrad Rzeszutek Wilk.

* tag 'pm-for-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
  cpuidle: Prevent null pointer dereference in cpuidle_coupled_cpu_notify
  cpuidle: coupled: fix sleeping while atomic in cpu notifier
  PM / Runtime: Check device PM QoS setting before "no callbacks" check
  PM / Runtime: Clear power.deferred_resume on success in rpm_suspend()
  PM / Runtime: Fix rpm_resume() return value for power.no_callbacks set
2012-08-18 14:39:19 -07:00
Todd Poynor a938da0682 PM / Sleep: Print name of wakeup source that aborts suspend
A driver or app may repeatedly request a wakeup source while the system
is attempting to enter suspend, which may indicate a bug or at least
point out a highly active system component that is responsible for
decreased battery life on a mobile device.  Even when the incidence
of suspend abort is not severe, identifying wakeup sources that
frequently abort suspend can be a useful clue for power management
analysis.

In some cases the existing stats can point out the offender where there is
an unexpectedly high activation count that stands out from the others, but
in other cases the wakeup source frequently taken just after the rest of
the system thinks its time to suspend might not stand out in the overall
stats.

It is also often useful to have information about what's been happening
recently, rather than totals of all activity for the system boot.

It's suggested to dump a line about which wakeup source
aborted suspend to aid analysis of these situations.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-08-17 19:40:50 +02:00
Rafael J. Wysocki 55d7ec4520 PM / Runtime: Check device PM QoS setting before "no callbacks" check
If __dev_pm_qos_read_value(dev) returns a negative value,
rpm_suspend() should return -EPERM for dev even if its
power.no_callbacks flag is set.  For this to happen, the device's
power.no_callbacks flag has to be checked after the PM QoS check,
so move the PM QoS check to rpm_check_suspend_allowed() (this will
make it cover idle notifications as well as runtime suspend too).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org
2012-08-17 19:36:36 +02:00
Rafael J. Wysocki 58a34de7b1 PM / Runtime: Clear power.deferred_resume on success in rpm_suspend()
The power.deferred_resume can only be set if the runtime PM status
of device is RPM_SUSPENDING and it should be cleared after its
status has been changed, regardless of whether or not the runtime
suspend has been successful.  However, it only is cleared on
suspend failure, while it may remain set on successful suspend and
is happily leaked to rpm_resume() executed in that case.

That shouldn't happen, so if power.deferred_resume is set in
rpm_suspend() after the status has been changed to RPM_SUSPENDED,
clear it before calling rpm_resume().  Then, it doesn't need to be
cleared before changing the status to RPM_SUSPENDING any more,
because it's always cleared after the status has been changed to
either RPM_SUSPENDED (on success) or RPM_ACTIVE (on failure).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org
2012-08-17 19:36:36 +02:00
Rafael J. Wysocki 7f321c26c0 PM / Runtime: Fix rpm_resume() return value for power.no_callbacks set
For devices whose power.no_callbacks flag is set, rpm_resume()
should return 1 if the device's parent is already active, so that
the callers of pm_runtime_get() don't think that they have to wait
for the device to resume (asynchronously) in that case (the core
won't queue up an asynchronous resume in that case, so there's
nothing to wait for anyway).

Modify the code accordingly (and make sure that an idle notification
will be queued up on success, even if 1 is to be returned).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org
2012-08-17 19:36:35 +02:00
Linus Torvalds c83917976f Driver core fixes for 3.6-rc3
Here are two tiny patches, one fixing a dynamic debug problem that the printk
 rework turned up, and the other one fixing an extcon problem that people
 reported.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iEYEABECAAYFAlAueMIACgkQMUfUDdst+ymSRACgsoRAFYZMSG2bSCkM3LBHVpo6
 w1wAoMrN+5ooCJfnWrRftn/s0M7Tpocc
 =o7Cx
 -----END PGP SIGNATURE-----

Merge tag 'driver-core-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg Kroah-Hartman:
 "Here are two tiny patches, one fixing a dynamic debug problem that the
  printk rework turned up, and the other one fixing an extcon problem
  that people reported.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'driver-core-3.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  extcon: extcon_gpio: Replace gpio_request_one by devm_gpio_request_one
  drivers-core: make structured logging play nice with dynamic-debug
2012-08-17 10:16:30 -07:00
Ming Lei ab6dd8e5ec firmware loader: fix build failure if FW_LOADER is m
device_cache_fw_images need to iterate devices in system,
so this patch applies the introduced dpm_for_each_dev to
avoid link failure if CONFIG_FW_LOADER is m.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 07:37:35 -07:00
Ming Lei dfe3212e01 PM / Sleep: introduce dpm_for_each_dev
dpm_list and its pm lock provide a good way to iterate all
devices in system. Except this way, there is no other easy
way to iterate devices in system.

firmware loader need to cache firmware images for devices
before system sleep, so introduce the function to meet its
demand.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 07:37:35 -07:00
Ming Lei c08f67730a firmware loader: fix compile failure if !PM
'return 0' should be added to fw_pm_notify if !PM because
return value of the funcion is defined as 'int'.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-17 07:36:11 -07:00
Ming Lei 07646d9c09 firmware loader: cache devices firmware during suspend/resume cycle
This patch implements caching devices' firmware automatically
during system syspend/resume cycle, so any device drivers can
call request_firmware or request_firmware_nowait inside resume
path to get the cached firmware if they have loaded firmwares
successfully at least once before entering suspend.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:44:44 -07:00
Ming Lei ffe53f6f38 firmware loader: use small timeout for cache device firmware
Because device_cache_fw_images only cache the firmware which has been
loaded sucessfully at leat once, using a small loading timeout should
be reasonable.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:44:44 -07:00
Ming Lei 37276a51f8 firmware: introduce device_cache/uncache_fw_images
This patch introduces the three helpers below:

	void device_cache_fw_images(void)
	void device_uncache_fw_images(void)
	void device_uncache_fw_images_delay(unsigned long)

so we can use device_cache_fw_images() to cache firmware for
all devices which need firmware to work, and the device driver
can get the firmware easily from kernel memory when system isn't
ready for completing requests of loading firmware.

After system is ready for completing firmware loading, driver core
will call device_uncache_fw_images() or its delay version to free
the cached firmware.

The above helpers will be used to cache device firmware during
system suspend/resume cycle in the following patches.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:44:44 -07:00
Ming Lei bddb1b9078 driver core: devres: introduce devres_for_each_res
This patch introduces one devres API of devres_for_each_res
so that the device's driver can iterate each resource it has
interest in.

The firmware loader will use the API to get each firmware name
from the device instance.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:30:29 -07:00
Ming Lei f531f05ae9 firmware loader: store firmware name into devres list
This patch will store firmware name into devres list of the device
which is requesting firmware loading, so that we can implement
auto cache and uncache firmware for devices in need.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:28:50 -07:00
Ming Lei 6f21a62a58 firmware loader: fix comments on request_firmware_nowait
request_firmware_nowait is allowed to be called in atomic
context now if @gfp is GFP_ATOMIC, so fix the obsolete
comments and states which situations are suitable for using
it.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:28:50 -07:00
Ming Lei 0cfc1e1e7b firmware loader: fix device lifetime
Callers of request_firmware* must hold the reference count of
@device, otherwise it is easy to trigger oops since the firmware
loader device is the child of @device.

This patch adds comments about the usage. In fact, most of drivers
call request_firmware* in its probe() or open(), so the constraint
should be reasonable and can be satisfied.

Also this patch holds the reference count of @device before
schedule_work() in request_firmware_nowait() to avoid that
the @device is released after request_firmware_nowait returns
and before the worker function is scheduled.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:28:50 -07:00
Ming Lei 2887b3959c firmware loader: introduce cache_firmware and uncache_firmware
This patches introduce two kernel APIs of cache_firmware and
uncache_firmware, both of which take the firmware file name
as the only parameter.

So any drivers can call cache_firmware to cache the specified
firmware file into kernel memory, and can use the cached firmware
in situations which can't request firmware from user space.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:24:21 -07:00
Ming Lei 1f2b79599e firmware loader: always let firmware_buf own the pages buffer
This patch always let firmware_buf own the pages buffer allocated
inside firmware_data_write, and add all instances of firmware_buf
into the firmware cache global list. Also introduce one private field
in 'struct firmware', so release_firmware will see the instance of
firmware_buf associated with the current firmware instance, then just
'free' the instance of firmware_buf.

The firmware_buf instance represents one pages buffer for one
firmware image, so lots of firmware loading requests can share
the same firmware_buf instance if they request the same firmware
image file.

This patch will make implementation of the following cache_firmware/
uncache_firmware very easy and simple.

In fact, the patch improves request_formware/release_firmware:

        - only request userspace to write firmware image once if
	several devices share one same firmware image and its drivers
	call request_firmware concurrently.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:22:45 -07:00
Ming Lei 1244691c73 firmware loader: introduce firmware_buf
This patch introduces struct firmware_buf to describe the buffer
which holds the firmware data, which will make the following
cache_firmware/uncache_firmware implemented easily.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:15:08 -07:00
Ming Lei 99c2aa7230 firmware loader: fix creation failure of fw loader device
If one device driver calls request_firmware_nowait() to request
several different firmwares' loading, device_add() will return
failure since all firmware loader device use same name of the
device who is requesting firmware.

This patch always use the name of firmware image as the firmware
loader device name to fix the problem since the following patches
for caching firmware will make sure only one loading for same
firmware is alllowd at the same time.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:13:19 -07:00
Ming Lei 0c25a850f7 firmware loader: remove unnecessary wmb()
The wmb() inside fw_load_abort is not necessary, since
complete() and wait_on_completion() has implied one pair
of memory barrier.

Also wmb() isn't a correct usage, so just remove it.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:13:18 -07:00
Ming Lei 28eefa750b firmware loader: fix races during loading firmware
This patch fixes two races in loading firmware:

1, FW_STATUS_DONE should be set before waking up the task waitting
on _request_firmware_load, otherwise FW_STATUS_ABORT may be
thought as DONE mistakenly.

2, Inside _request_firmware_load(), there is a small window between
wait_for_completion() and mutex_lock(&fw_lock), and 'echo 1 > loading'
still may happen during the period, so this patch checks FW_STATUS_DONE
to prevent pages' buffer completed from being freed in firmware_loading_store.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:13:18 -07:00
Ming Lei 65710cb6ea firmware loader: simplify pages ownership transfer
This patch doesn't transfer ownership of pages' buffer to the
instance of firmware until the firmware loading is completed,
which will simplify firmware_loading_store a lot, so help
to introduce the following cache_firmware and uncache_firmware
mechanism during system suspend-resume cycle.

In fact, this patch fixes one bug: if writing data into
firmware loader device is bypassed between writting 1 and 0 to
'loading', OOPS will be triggered without the patch.

Also handle the vmap failure case, and add some comments to make
code more readable.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 13:13:18 -07:00
Jean Delvare 689ae231af platform: Add support for automatic device IDs
Right now we have support for explicit platform device IDs, as well as
ID-less platform devices when a given device type can only have one
instance. However there are cases where multiple instances of a device
type can exist, and their IDs aren't (and can't be) known in advance
and do not matter. In that case we need automatic device IDs to avoid
device name collisions.

I am using magic ID value -2 (PLATFORM_DEVID_AUTO) for this, similar
to -1 for ID-less devices. The automatically allocated device IDs are
global (to avoid an additional per-driver cost.) We keep note that the
ID was automatically allocated so that it can be freed later.

Note that we also restore the ID to PLATFORM_DEVID_AUTO on error and
device deletion, to avoid avoid unexpected behavior on retry. I don't
really expect retries on platform device addition, but better safe
than sorry.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 10:32:07 -07:00
Ming Lei a525a3ddea driver core: free devres in device_release
device_del can happen anytime, so once it happens,
the devres of the device will be freed inside device_del, but
drivers can't know it has been deleted and may still add
resources into the device, so memory leak is caused.

This patch moves the devres_release_all to fix the problem.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 10:32:07 -07:00
Jim Cromie af7f2158fd drivers-core: make structured logging play nice with dynamic-debug
commit c4e00daaa9 changed __dev_printk
in a way that broke dynamic-debug's ability to control the dynamic
prefix of dev_dbg(dev,..), but not dev_dbg(NULL,..) or pr_debug(..),
which is why it wasnt noticed sooner.

When dev==NULL, __dev_printk() just calls printk(), which just works.
But otherwise, it assumed that level was always a string like "<L>"
and just plucked out the 'L', ignoring the rest.  However,
dynamic_emit_prefix() adds "[tid] module:func:line:" to the string,
those additions all got lost.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: stable <stable@vger.kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16 10:20:53 -07:00
Rafael J. Wysocki 77254950bb PM: Make dev_pm_get_subsys_data() always return 0 on success
Commits 1d5fcfec22 (PM / Domains: Add device domain data reference
counter) and 62d4490294 (PM / Domains: Allow device callbacks to be
added at any time) added checks for the return value of
dev_pm_get_subsys_data(), but those checks were incorrect, because
that function returned 1 on success in some cases.

Since all of the existing users of dev_pm_get_subsys_data() don't use
the positive value returned by it on success, change its definition
so that it always returns 0 when successful.

Reported-by: Heiko Stübner <heiko@sntech.de>
Reported-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-08-08 20:49:33 +02:00
Mark Brown 0c00c50b41 regmap: irq: Enable devices for runtime PM while handling interrupts
Some devices need to have a runtime PM reference while handling interrupts
to ensure that the register I/O is available. Support this with a flag in
the chip.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-07 20:29:45 +01:00
Stephen Warren 40052ca0c2 regmap: irq: initialize all irqs to wake disabled
The kerneldoc for irq_set_irq_wake() says:

    Enable/disable power management wakeup mode, which is
    disabled by default.

regmap_irq_set_wake() clears bits to enable wake for an interrupt,
and sets bits to disable wake. Hence, we should set all bits in
wake_buf initially, to mirror the expected disabled state.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 12:13:54 +01:00
Stephen Warren 685879f4b2 regmap: set MASK_ON_SUSPEND/SKIP_SET_WAKE if no wake_base
If a regmap-irq chip has no wake base:

* There's no point calling .irq_set_wake, hence IRQCHIP_SKIP_SET_WAKE.

* If some IRQs in the chip are enabled for wake and some aren't, we
  should mask those interrupts that are not wake enabled, so that if
  they occur during suspend, the system is not awoken. Hence,
  IRQCHIP_MASK_ON_SUSPEND.

Note that IRQCHIP_MASK_ON_SUSPEND is handled by check_wakeup_irqs(),
which always iterates over every single interrupt in the system,
irrespective of whether an interrupt is a child of a controller whose
output interrupt has no wake-enabled inputs and hence is presumably
masked itself. Hence this change might cause interrupt unnecessary
masking operations and associated register I/O.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 12:13:53 +01:00
Stephen Warren ca142750f8 regmap: name irq_chip based on regmap_irq_chip's name
This is intended to give each irq_chip a useful name, rather than hard-
coding them all as "regmap".

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 12:13:53 +01:00
Stephen Warren 7ac140ec42 regmap: store irq_chip inside regmap_irq_chip_data
This will allow later patches to adjust portions of the irq_chip
individually for each regmap_irq_chip that is created.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 12:13:53 +01:00
Mark Brown 0eb46ad0c8 regmap: irq: Only update mask bits when doing initial mask
Don't write the full register, it's possible there's bits other than the
masks in the same register which we shouldn't be changing.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
2012-08-04 12:13:53 +01:00
Stephen Warren 16032624f5 regmap: fix some error messages to take account of irq_reg_stride
A number of places in the code were printing error messages that included
the address of a register, but were not calculating the register address
in the same way as the access to the register. Use a temporary to solve
this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 12:13:53 +01:00
Dimitris Papastamos 4d879514e7 regmap: Don't lock in regmap_reinit_cache()
When bus->fast_io is set, the locking here is done with spinlocks.
This is currently true for the regmap-mmio bus implementation.

While holding a spinlock we can't go to sleep, various operations
like removing the debugfs entries or re-initializing the cache will
sleep, therefore, shift the locking up to the user.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-08-04 11:07:57 +01:00
Linus Torvalds a0e881b7c1 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull second vfs pile from Al Viro:
 "The stuff in there: fsfreeze deadlock fixes by Jan (essentially, the
  deadlock reproduced by xfstests 068), symlink and hardlink restriction
  patches, plus assorted cleanups and fixes.

  Note that another fsfreeze deadlock (emergency thaw one) is *not*
  dealt with - the series by Fernando conflicts a lot with Jan's, breaks
  userland ABI (FIFREEZE semantics gets changed) and trades the deadlock
  for massive vfsmount leak; this is going to be handled next cycle.
  There probably will be another pull request, but that stuff won't be
  in it."

Fix up trivial conflicts due to unrelated changes next to each other in
drivers/{staging/gdm72xx/usb_boot.c, usb/gadget/storage_common.c}

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (54 commits)
  delousing target_core_file a bit
  Documentation: Correct s_umount state for freeze_fs/unfreeze_fs
  fs: Remove old freezing mechanism
  ext2: Implement freezing
  btrfs: Convert to new freezing mechanism
  nilfs2: Convert to new freezing mechanism
  ntfs: Convert to new freezing mechanism
  fuse: Convert to new freezing mechanism
  gfs2: Convert to new freezing mechanism
  ocfs2: Convert to new freezing mechanism
  xfs: Convert to new freezing code
  ext4: Convert to new freezing mechanism
  fs: Protect write paths by sb_start_write - sb_end_write
  fs: Skip atime update on frozen filesystem
  fs: Add freezing handling to mnt_want_write() / mnt_drop_write()
  fs: Improve filesystem freezing handling
  switch the protection of percpu_counter list to spinlock
  nfsd: Push mnt_want_write() outside of i_mutex
  btrfs: Push mnt_want_write() outside of i_mutex
  fat: Push mnt_want_write() outside of i_mutex
  ...
2012-08-01 10:26:23 -07:00
Minchan Kim ee6f509c32 mm: factor out memory isolate functions
mm/page_alloc.c has some memory isolation functions but they are used only
when we enable CONFIG_{CMA|MEMORY_HOTPLUG|MEMORY_FAILURE}.  So let's make
it configurable by new CONFIG_MEMORY_ISOLATION so that it can reduce
binary size and we can check it simple by CONFIG_MEMORY_ISOLATION, not if
defined CONFIG_{CMA|MEMORY_HOTPLUG|MEMORY_FAILURE}.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-31 18:42:45 -07:00
Linus Torvalds 6f51f51582 Merge branch 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull DMA-mapping updates from Marek Szyprowski:
 "Those patches are continuation of my earlier work.

  They contains extensions to DMA-mapping framework to remove limitation
  of the current ARM implementation (like limited total size of DMA
  coherent/write combine buffers), improve performance of buffer sharing
  between devices (attributes to skip cpu cache operations or creation
  of additional kernel mapping for some specific use cases) as well as
  some unification of the common code for dma_mmap_attrs() and
  dma_mmap_coherent() functions.  All extensions have been implemented
  and tested for ARM architecture."

* 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  ARM: dma-mapping: add support for DMA_ATTR_SKIP_CPU_SYNC attribute
  common: DMA-mapping: add DMA_ATTR_SKIP_CPU_SYNC attribute
  ARM: dma-mapping: add support for dma_get_sgtable()
  common: dma-mapping: introduce dma_get_sgtable() function
  ARM: dma-mapping: add support for DMA_ATTR_NO_KERNEL_MAPPING attribute
  common: DMA-mapping: add DMA_ATTR_NO_KERNEL_MAPPING attribute
  common: dma-mapping: add support for generic dma_mmap_* calls
  ARM: dma-mapping: fix error path for memory allocation failure
  ARM: dma-mapping: add more sanity checks in arm_dma_mmap()
  ARM: dma-mapping: remove custom consistent dma region
  mm: vmalloc: use const void * for caller argument
  scatterlist: add sg_alloc_table_from_pages function
2012-07-30 10:11:31 -07:00
Marek Szyprowski d2b7428eb0 common: dma-mapping: introduce dma_get_sgtable() function
This patch adds dma_get_sgtable() function which is required to let
drivers to share the buffers allocated by DMA-mapping subsystem. Right
now the driver gets a dma address of the allocated buffer and the kernel
virtual mapping for it. If it wants to share it with other device (= map
into its dma address space) it usually hacks around kernel virtual
addresses to get pointers to pages or assumes that both devices share
the DMA address space. Both solutions are just hacks for the special
cases, which should be avoided in the final version of buffer sharing.

To solve this issue in a generic way, a new call to DMA mapping has been
introduced - dma_get_sgtable(). It allocates a scatter-list which
describes the allocated buffer and lets the driver(s) to use it with
other device(s) by calling dma_map_sg() on it.

This patch provides a generic implementation based on virt_to_page()
call. Architectures which require more sophisticated translation might
provide their own get_sgtable() methods.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-07-30 12:25:46 +02:00
Marek Szyprowski 64ccc9c033 common: dma-mapping: add support for generic dma_mmap_* calls
Commit 9adc5374 ('common: dma-mapping: introduce mmap method') added a
generic method for implementing mmap user call to dma_map_ops structure.

This patch converts ARM and PowerPC architectures (the only providers of
dma_mmap_coherent/dma_mmap_writecombine calls) to use this generic
dma_map_ops based call and adds a generic cross architecture
definition for dma_mmap_attrs, dma_mmap_coherent, dma_mmap_writecombine
functions.

The generic mmap virt_to_page-based fallback implementation is provided for
architectures which don't provide their own implementation for mmap method.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
2012-07-30 12:25:46 +02:00
Al Viro 921a1650de new helper: done_path_create()
releases what needs to be released after {kern,user}_path_create()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-29 21:24:13 +04:00
Linus Torvalds fa93669a19 Driver core merge for 3.6-rc1
Here's the big driver core pull request for 3.6-rc1.
 
 Unlike 3.5, this kernel should be a lot tamer, with the printk changes now
 settled down.  All we have here is some extcon driver updates, w1 driver
 updates, a few printk cleanups that weren't needed for 3.5, but are good to
 have now, and some other minor fixes/changes in the driver core.
 
 All of these have been in the linux-next releases for a while now.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iEYEABECAAYFAlARgIUACgkQMUfUDdst+ynDHgCfRNwIB9L+zZvjcKE5e1BhDbUl
 wVUAn398DFgbJ1+PjGkd1EMR2uVTh7Ou
 =MIFu
 -----END PGP SIGNATURE-----

Merge tag 'driver-core-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core changes from Greg Kroah-Hartman:
 "Here's the big driver core pull request for 3.6-rc1.

  Unlike 3.5, this kernel should be a lot tamer, with the printk changes
  now settled down.  All we have here is some extcon driver updates, w1
  driver updates, a few printk cleanups that weren't needed for 3.5, but
  are good to have now, and some other minor fixes/changes in the driver
  core.

  All of these have been in the linux-next releases for a while now.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'driver-core-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (38 commits)
  printk: Export struct log size and member offsets through vmcoreinfo
  Drivers: hv: Change the hex constant to a decimal constant
  driver core: don't trigger uevent after failure
  extcon: MAX77693: Add extcon-max77693 driver to support Maxim MAX77693 MUIC device
  sysfs: fail dentry revalidation after namespace change fix
  sysfs: fail dentry revalidation after namespace change
  extcon: spelling of detach in function doc
  extcon: arizona: Stop microphone detection if we give up on it
  extcon: arizona: Update cable reporting calls and split headset
  PM / Runtime: Do not increment device usage counts before probing
  kmsg - do not flush partial lines when the console is busy
  kmsg - export "continuation record" flag to /dev/kmsg
  kmsg - avoid warning for CONFIG_PRINTK=n compilations
  kmsg - properly print over-long continuation lines
  driver-core: Use kobj_to_dev instead of re-implementing it
  driver-core: Move kobj_to_dev from genhd.h to device.h
  driver core: Move deferred devices to the end of dpm_list before probing
  driver core: move uevent call to driver_register
  driver core: fix shutdown races with probe/remove(v3)
  Extcon: Arizona: Add driver for Wolfson Arizona class devices
  ...
2012-07-26 11:25:33 -07:00
Linus Torvalds bdc0077af5 SCSI misc on 20120724
The most important feature of this patch set is the new async infrastructure
 that makes sure async_synchronize_full() synchronizes all domains and allows
 us to remove all the hacks (like having scsi_complete_async_scans() in the
 device base code) and means that the async infrastructure will "just work" in
 future. The rest is assorted driver updates (aacraid, bnx2fc, virto-scsi,
 megaraid, bfa, lpfc, qla2xxx, qla4xxx) plus a lot of infrastructure work in
 sas and FC.
 
 Signed-off-by: James Bottomley <JBottomley@Parallels.com>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iQEcBAABAgAGBQJQDjDCAAoJEDeqqVYsXL0M/sMH/jVgBfF1mjR+DQuTscKyD21w
 0BQLn5OmvDZDqo44iqQzNRObw7CxkBkUtHoozsknLijw+KggER653ZOAtUdIHfI/
 /uo7iJQ3J3D/Ezm99HYSpZiF2juZwsBRtFBoKkGqOpMlzFUx5o4hUbH5OcINxnHR
 VmvJU5K1kg8D77Q6zK+Atl14/Rfibc2IoufFmbYdplUAM/tV0BpBSSHJAJvqua76
 NGMl4KJcPZnXe/4LXcxZia5A2efdFFEzaQ2mM9rUVEAgHDAxc0Zg9IoDhGd08FX4
 G55NK+6+bKb9s7bgyva0T/iy817TRCzjteeYNFrb8nBRe7aQbAivaBHQFXIyvdQ=
 =y2sh
 -----END PGP SIGNATURE-----

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull first round of SCSI updates from James Bottomley:
 "The most important feature of this patch set is the new async
  infrastructure that makes sure async_synchronize_full() synchronizes
  all domains and allows us to remove all the hacks (like having
  scsi_complete_async_scans() in the device base code) and means that
  the async infrastructure will "just work" in future.

  The rest is assorted driver updates (aacraid, bnx2fc, virto-scsi,
  megaraid, bfa, lpfc, qla2xxx, qla4xxx) plus a lot of infrastructure
  work in sas and FC.

  Signed-off-by: James Bottomley <JBottomley@Parallels.com>"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (97 commits)
  [SCSI] Revert "[SCSI] fix async probe regression"
  [SCSI] cleanup usages of scsi_complete_async_scans
  [SCSI] queue async scan work to an async_schedule domain
  [SCSI] async: make async_synchronize_full() flush all work regardless of domain
  [SCSI] async: introduce 'async_domain' type
  [SCSI] bfa: Fix to set correct return error codes and misc cleanup.
  [SCSI] aacraid: Series 7 Async. (performance) mode support
  [SCSI] aha152x: Allow use on 64bit systems
  [SCSI] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning
  [SCSI] bfa: squelch lockdep complaint with a spin_lock_init
  [SCSI] qla2xxx: remove unnecessary reads of PCI_CAP_ID_EXP
  [SCSI] qla4xxx: remove unnecessary read of PCI_CAP_ID_EXP
  [SCSI] ufs: fix incorrect return value about SUCCESS and FAILED
  [SCSI] ufs: reverse the ufshcd_is_device_present logic
  [SCSI] ufs: use module_pci_driver
  [SCSI] usb-storage: update usb devices for write cache quirk in quirk list.
  [SCSI] usb-storage: add support for write cache quirk
  [SCSI] set to WCE if usb cache quirk is present.
  [SCSI] virtio-scsi: hotplug support for virtio-scsi
  [SCSI] virtio-scsi: split scatterlist per target
  ...
2012-07-24 18:11:22 -07:00
Linus Torvalds a66d2c8f7e Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull the big VFS changes from Al Viro:
 "This one is *big* and changes quite a few things around VFS.  What's in there:

   - the first of two really major architecture changes - death to open
     intents.

     The former is finally there; it was very long in making, but with
     Miklos getting through really hard and messy final push in
     fs/namei.c, we finally have it.  Unlike his variant, this one
     doesn't introduce struct opendata; what we have instead is
     ->atomic_open() taking preallocated struct file * and passing
     everything via its fields.

     Instead of returning struct file *, it returns -E...  on error, 0
     on success and 1 in "deal with it yourself" case (e.g.  symlink
     found on server, etc.).

     See comments before fs/namei.c:atomic_open().  That made a lot of
     goodies finally possible and quite a few are in that pile:
     ->lookup(), ->d_revalidate() and ->create() do not get struct
     nameidata * anymore; ->lookup() and ->d_revalidate() get lookup
     flags instead, ->create() gets "do we want it exclusive" flag.

     With the introduction of new helper (kern_path_locked()) we are rid
     of all struct nameidata instances outside of fs/namei.c; it's still
     visible in namei.h, but not for long.  Come the next cycle,
     declaration will move either to fs/internal.h or to fs/namei.c
     itself.  [me, miklos, hch]

   - The second major change: behaviour of final fput().  Now we have
     __fput() done without any locks held by caller *and* not from deep
     in call stack.

     That obviously lifts a lot of constraints on the locking in there.
     Moreover, it's legal now to call fput() from atomic contexts (which
     has immediately simplified life for aio.c).  We also don't need
     anti-recursion logics in __scm_destroy() anymore.

     There is a price, though - the damn thing has become partially
     asynchronous.  For fput() from normal process we are guaranteed
     that pending __fput() will be done before the caller returns to
     userland, exits or gets stopped for ptrace.

     For kernel threads and atomic contexts it's done via
     schedule_work(), so theoretically we might need a way to make sure
     it's finished; so far only one such place had been found, but there
     might be more.

     There's flush_delayed_fput() (do all pending __fput()) and there's
     __fput_sync() (fput() analog doing __fput() immediately).  I hope
     we won't need them often; see warnings in fs/file_table.c for
     details.  [me, based on task_work series from Oleg merged last
     cycle]

   - sync series from Jan

   - large part of "death to sync_supers()" work from Artem; the only
     bits missing here are exofs and ext4 ones.  As far as I understand,
     those are going via the exofs and ext4 trees resp.; once they are
     in, we can put ->write_super() to the rest, along with the thread
     calling it.

   - preparatory bits from unionmount series (from dhowells).

   - assorted cleanups and fixes all over the place, as usual.

  This is not the last pile for this cycle; there's at least jlayton's
  ESTALE work and fsfreeze series (the latter - in dire need of fixes,
  so I'm not sure it'll make the cut this cycle).  I'll probably throw
  symlink/hardlink restrictions stuff from Kees into the next pile, too.
  Plus there's a lot of misc patches I hadn't thrown into that one -
  it's large enough as it is..."

* 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (127 commits)
  ext4: switch EXT4_IOC_RESIZE_FS to mnt_want_write_file()
  btrfs: switch btrfs_ioctl_balance() to mnt_want_write_file()
  switch dentry_open() to struct path, make it grab references itself
  spufs: shift dget/mntget towards dentry_open()
  zoran: don't bother with struct file * in zoran_map
  ecryptfs: don't reinvent the wheels, please - use struct completion
  don't expose I_NEW inodes via dentry->d_inode
  tidy up namei.c a bit
  unobfuscate follow_up() a bit
  ext3: pass custom EOF to generic_file_llseek_size()
  ext4: use core vfs llseek code for dir seeks
  vfs: allow custom EOF in generic_file_llseek code
  vfs: Avoid unnecessary WB_SYNC_NONE writeback during sys_sync and reorder sync passes
  vfs: Remove unnecessary flushing of block devices
  vfs: Make sys_sync writeout also block device inodes
  vfs: Create function for iterating over block devices
  vfs: Reorder operations during sys_sync
  quota: Move quota syncing to ->sync_fs method
  quota: Split dquot_quota_sync() to writeback and cache flushing part
  vfs: Move noop_backing_dev_info check from sync into writeback
  ...
2012-07-23 12:27:27 -07:00
Linus Torvalds 7100e505b7 Power management updates for 3.6
* ACPI conversion to PM handling based on struct dev_pm_ops.
 * Conversion of a number of platform drivers to PM handling based on struct
   dev_pm_ops and removal of empty legacy PM callbacks from a couple of PCI
   drivers.
 * Suspend-to-both for in-kernel hibernation from Bojan Smojver.
 * cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti U Murthy.
 * cpufreq bug fixes from Jonghwa Lee and Stephen Boyd.
 * Suspend and hibernate fixes from Srivatsa S. Bhat and Colin Cross.
 * Generic PM domains framework updates.
 * RTC CMOS wakeup signaling update from Paul Fox.
 * sparse warnings fixes from Sachin Kamat.
 * Build warnings fixes for the generic PM domains framework and PM sysfs code.
 * sysfs switch for printing device suspend times from Sameer Nanda.
 * Documentation fix from Oskar Schirmer.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.18 (GNU/Linux)
 
 iQIcBAABAgAGBQJQDF5eAAoJEKhOf7ml8uNsEaAP/2wg4faoOGob5A0/7tLqG3Cw
 xnTmGsfL7wG07Q8ykCL1BSlBb1VeJz8L6LTmUpaABI4M//oIBlcYQKyCE0Tat1AO
 9bJXFzK7qcHMhkTz6d6LDqtVzR3NGM3ypjZqj8aEXBov07LMR1AXvgNwXXhv25zM
 0unwrh1XNinBN3n+oaktpWk1YHUjsa5IMU+2tQJrocuHXcgK30vGXZVrZ4g9w1c2
 eS+ED1oKUqOYtFzIUX+aCtaDDheGaPlugk/GOtIB7Sae0s0vMlxH/T5ncB4SxRC+
 v3s4OykqQc5Dc8+0bNlBH7ykSVNB0PoQiyKDY67CxtH+q1xQSc9/f3XJqnGMaVDE
 17eZUZsL4qSyzRuCbPCGAgwBHmx3qNCMu1i1BcmnSxU+ikPUeCR7mYOP0mRThwPH
 OSfs+c/vZ+Ow6CwVE4UFrbm9Jve7ADnCrlZzT2m6XjhHGyjKP7SJlzP9TPsZ0LRk
 oxgQDYHmxbo50t9tBCz5L4ZTMKkDp28e78x84/CteP85srcW3GqDxrPyp2uzJu5O
 tvIEBvVlc4ucq8sG83RkugQwrG/2cQwG2HO9ERAwq01HHA1BYsuU3A961Jqf5CZo
 nFRSnByvVj/imPf47OWpDPAbVEs7jxufJuLEbPwGj1MkttTGDBIRu3zldXt2S6kP
 Q4qYU6fDaQQHFc90pqxQ
 =vC4/
 -----END PGP SIGNATURE-----

Merge tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:

 - ACPI conversion to PM handling based on struct dev_pm_ops.
 - Conversion of a number of platform drivers to PM handling based on
   struct dev_pm_ops and removal of empty legacy PM callbacks from a
   couple of PCI drivers.
 - Suspend-to-both for in-kernel hibernation from Bojan Smojver.
 - cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti
   Murthy.
 - cpufreq bug fixes from Jonghwa Lee and Stephen Boyd.
 - Suspend and hibernate fixes from Srivatsa Bhat and Colin Cross.
 - Generic PM domains framework updates.
 - RTC CMOS wakeup signaling update from Paul Fox.
 - sparse warnings fixes from Sachin Kamat.
 - Build warnings fixes for the generic PM domains framework and PM
   sysfs code.
 - sysfs switch for printing device suspend times from Sameer Nanda.
 - Documentation fix from Oskar Schirmer.

* tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (70 commits)
  cpufreq: Fix sysfs deadlock with concurrent hotplug/frequency switch
  EXYNOS: bugfix on retrieving old_index from freqs.old
  PM / Sleep: call early resume handlers when suspend_noirq fails
  PM / QoS: Use NULL pointer instead of plain integer in qos.c
  PM / QoS: Use NULL pointer instead of plain integer in pm_qos.h
  PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock
  PM / Sleep: Add missing static storage class specifiers in main.c
  cpuilde / ACPI: remove time from acpi_processor_cx structure
  cpuidle / ACPI: remove usage from acpi_processor_cx structure
  cpuidle / ACPI : remove latency_ticks from acpi_processor_cx structure
  rtc-cmos: report wakeups from interrupt handler
  PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset
  PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset
  olpc-xo15-sci: Use struct dev_pm_ops for power management
  PM / Domains: Replace plain integer with NULL pointer in domain.c file
  PM / Domains: Add missing static storage class specifier in domain.c file
  PM / crypto / ux500: Use struct dev_pm_ops for power management
  PM / IPMI: Remove empty legacy PCI PM callbacks
  tpm_nsc: Use struct dev_pm_ops for power management
  tpm_tis: Use struct dev_pm_ops for power management
  ...
2012-07-22 13:36:52 -07:00
Linus Torvalds 7cd58b0a3b regmap: Updates for 3.6
A few fixes plus a few features, the most generally useful thing being
 the register paging support which can be used by quite a few devices:
 
 - Support for wake IRQs in regmap-irq
 - Support for register paging
 - Support for explicitly specified endianness, mostly for MMIO.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABAgAGBQJQDEZ4AAoJEBus8iNuMP3diagQAIsrFy8zV+7JikPJN5H70gsj
 lvlTzmT0ldMYhheuciBCTgyQCSZd2MH6FpfI8El0sYk9TsZyBASiOMNBvRPhEubP
 DetnEBY85mtU9Wryi+AuGrFnt00us4+wf37Ubf5AXF5q+ZcNQzJaR59iVcdghrf6
 Dj0kdErHuwziBF3gmm4MGX72qP15QlG9GtO2MwiuLtsnJ34lNlTnglClxUaKX8vi
 eFY+wfnsfam8CSbfs9XewUsvdA1c2o+7/pm3pVOuns6FA7CyfeaWQixmo7VcKLHn
 g70Qezc+HNjpxHcZaP94Oaq1dC/32rwHXZweSfePj6c3y4Mr2czCTF4jPUtV6cfA
 LQdRcCi73iKwI1XrdUEqJOojEHErmeL+YZ9SzTSroNHv54V7KvMHz99gYs31f+gH
 R44ZxbTWKhpjeFmDUqv/rZ891pKUli4AHNJi9jOTgHmEdBK+b0dDUmPZhkz2x19N
 8KOpr5T3yDbancULdpfkp3vOTtJE3eACFFytH9ZtM7SeCoYWtwDSR3ALpmQ41JFk
 p+ITOrsBYC3kiwjMrBEVd6HFvYl60Q8RDwHoZpqk2PNpy9yuyYqFXjmdPsjxf/gw
 WGTcYEceocsylJ20GnZ3Btkk3uANRPmPoQZdhOO/IB9cnCw7m9EDZqNBpY/LLiIB
 /jWn4E28pSxTnVYkd7b9
 =uSSe
 -----END PGP SIGNATURE-----

Merge tag 'regmap-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "A few fixes plus a few features, the most generally useful thing being
  the register paging support which can be used by quite a few devices:

   - Support for wake IRQs in regmap-irq
   - Support for register paging
   - Support for explicitly specified endianness, mostly for MMIO."

* tag 'regmap-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Fix incorrect arguments to kzalloc() call
  regmap: Add hook for printk logging for debugging during early init
  regmap: Fix work_buf switching for page update during virtual range access.
  regmap: Add support for register indirect addressing.
  regmap: Move lock out from internal function _regmap_update_bits().
  regmap: mmio: Staticize regmap_mmio_gen_context()
  regmap: Remove warning on stubbed dev_get_regmap()
  regmap: Implement support for wake IRQs
  regmap: Don't try to map non-existant IRQs
  regmap: Constify regmap_irq_chip
  regmap: mmio: request native endian formatting
  regmap: allow busses to request formatting with specific endianness
2012-07-22 13:03:14 -07:00
Mark Brown 38e23194e1 Merge branches 'regmap-core', 'regmap-irq' and 'regmap-page' into regmap-next
Conflicts (trivial context stuff):
	drivers/base/regmap/regmap.c
	include/linux/regmap.h
2012-07-22 19:26:07 +01:00
Dan Williams 492d542273 [SCSI] cleanup usages of scsi_complete_async_scans
Now that scsi registers its async scan work with the async subsystem,
wait_for_device_probe() is sufficient for ensuring all scanning is
complete.

[jejb: fix merge problems with eea03c20ae Make wait_for_device_probe() also do scsi_complete_async_scans()]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-07-20 09:25:22 +01:00
Rafael J. Wysocki 382e159619 Merge branch 'pm-sleep'
* pm-sleep:
  PM / Sleep: call early resume handlers when suspend_noirq fails
2012-07-19 10:39:21 +02:00
Colin Cross 064b021fbe PM / Sleep: call early resume handlers when suspend_noirq fails
Commit cf579dfb82 (PM / Sleep: Introduce
"late suspend" and "early resume" of devices) introduced a bug where
suspend_late handlers would be called, but if dpm_suspend_noirq returned
an error the early_resume handlers would never be called.  All devices
would end up on the dpm_late_early_list, and would never be resumed
again.

Fix it by calling dpm_resume_early when dpm_suspend_noirq returns
an error.

Signed-off-by: Colin Cross <ccross@android.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-19 10:38:06 +02:00
Linus Torvalds eea03c20ae Make wait_for_device_probe() also do scsi_complete_async_scans()
Commit a7a20d1039 ("sd: limit the scope of the async probe domain")
make the SCSI device probing run device discovery in it's own async
domain.

However, as a result, the partition detection was no longer synchronized
by async_synchronize_full() (which, despite the name, only synchronizes
the global async space, not all of them).  Which in turn meant that
"wait_for_device_probe()" would not wait for the SCSI partitions to be
parsed.

And "wait_for_device_probe()" was what the boot time init code relied on
for mounting the root filesystem.

Now, most people never noticed this, because not only is it
timing-dependent, but modern distributions all use initrd.  So the root
filesystem isn't actually on a disk at all.  And then before they
actually mount the final disk filesystem, they will have loaded the
scsi-wait-scan module, which not only does the expected
wait_for_device_probe(), but also does scsi_complete_async_scans().

[ Side note: scsi_complete_async_scans() had also been partially broken,
  but that was fixed in commit 43a8d39d01 ("fix async probe
  regression"), so that same commit a7a20d1039 had actually broken
  setups even if you used scsi-wait-scan explicitly ]

Solve this problem by just moving the scsi_complete_async_scans() call
into wait_for_device_probe().  Everybody who wants to wait for device
probing to finish really wants the SCSI probing to complete, so there's
no reason not to do this.

So now "wait_for_device_probe()" really does what the name implies, and
properly waits for device probing to finish.  This also removes the now
unnecessary extra calls to scsi_complete_async_scans().

Reported-and-tested-by: Artem S. Tashkinov <t.artem@mailcity.com>
Cc: Dan Williams <dan.j.williams@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: Borislav Petkov <bp@amd64.org>
Cc: linux-scsi <linux-scsi@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-18 18:15:46 -07:00
Rafael J. Wysocki bd798b7a88 Merge branch 'pm-qos'
* pm-qos:
  PM / QoS: Use NULL pointer instead of plain integer in qos.c
  PM / QoS: Use NULL pointer instead of plain integer in pm_qos.h
2012-07-19 00:03:50 +02:00
Rafael J. Wysocki d52fdf1337 Merge branch 'pm-sleep'
* pm-sleep:
  PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock
  PM / Sleep: Add missing static storage class specifiers in main.c
  PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset
  PM / Hibernate: Print hibernation/thaw progress indicator one line at a time.
  PM / Sleep: Separate printing suspend times from initcall_debug
  PM / Sleep: add knob for printing device resume times
  ftrace: Disable function tracing during suspend/resume and hibernation, again
  PM / Hibernate: Enable suspend to both for in-kernel hibernation.
2012-07-19 00:03:29 +02:00
Rafael J. Wysocki 7791bd230c Merge branch 'pm-domains'
* pm-domains:
  PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset
  PM / Domains: Replace plain integer with NULL pointer in domain.c file
  PM / Domains: Add missing static storage class specifier in domain.c file
  PM / Domains: Allow device callbacks to be added at any time
  PM / Domains: Add device domain data reference counter
  PM / Domains: Add preliminary support for cpuidle, v2
  PM / Domains: Do not stop devices after restoring their states
  PM / Domains: Use subsystem runtime suspend/resume callbacks by default
2012-07-19 00:03:17 +02:00
Sachin Kamat ad0446eb11 PM / QoS: Use NULL pointer instead of plain integer in qos.c
Fix the following sparse warning:
drivers/base/power/qos.c:465:29: warning: Using plain integer as NULL pointer

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-19 00:02:36 +02:00
Sachin Kamat 7664e96935 PM / Sleep: Add missing static storage class specifiers in main.c
Fix the following sparse warnings:
drivers/base/power/main.c:48:1: warning: symbol 'dpm_prepared_list' was not declared. Should it be static?
drivers/base/power/main.c:49:1: warning: symbol 'dpm_suspended_list' was not declared. Should it be static?
drivers/base/power/main.c:50:1: warning: symbol 'dpm_late_early_list' was not declared. Should it be static?
drivers/base/power/main.c:51:1: warning: symbol 'dpm_noirq_list' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-18 23:57:47 +02:00
Dimitris Papastamos 463351194d regmap: Fix incorrect arguments to kzalloc() call
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-07-18 22:13:53 +01:00
Sebastian Ott a14af32564 driver core: don't trigger uevent after failure
Do not send the uevent if driver_add_groups failed.

Reported-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-17 10:40:23 -07:00
Rafael J. Wysocki eed5d21507 PM / Runtime: Do not increment device usage counts before probing
The pm_runtime_get_noresume() calls before really_probe() and
before executing __device_attach() for each driver on the
device's bus cause problems to happen if probing fails and if the
driver has enabled runtime PM for the device in its .probe()
callback.  Namely, in that case, if the device has been resumed
by the driver after enabling its runtime PM and if it turns out that
.probe() should return an error, the driver is supposed to suspend
the device and disable its runtime PM before exiting .probe().
However, because the device's runtime PM usage counter was
incremented by the core before calling .probe(), the driver's attempt
to suspend the device will not succeed and the device will remain in
the full-power state after the failing .probe() has returned.

To fix this issue, remove the pm_runtime_get_noresume() calls from
driver_probe_device() and from device_attach() and replace the
corresponding pm_runtime_put_sync() calls with pm_runtime_idle()
to preserve the existing behavior (which is to check if the device
is idle and to suspend it eventually in that case after probing).

Reported-and-tested-by: Kevin Hilman <khilman@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 19:25:49 -07:00
Lars-Peter Clausen b0d1f807f3 driver-core: Use kobj_to_dev instead of re-implementing it
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 18:05:45 -07:00
Mark Brown 8153584e3f driver core: Move deferred devices to the end of dpm_list before probing
When deferred probe was originally added the idea was that devices which
defer their probes would move themselves to the end of dpm_list in order
to try to keep the assumptions that we're making about the list being in
roughly the order things should be suspended correct. However this hasn't
been what's been happening and doing it requires a lot of duplicated code
to do the moves.

Instead take a simple, brute force solution and have the deferred probe
code push devices to the end of dpm_list before it retries the probe. This
does mean we lock the dpm_list a bit more often but it's very simple and
the code shouldn't be a fast path. We do the move with the deferred mutex
dropped since doing things with fewer locks held simultaneously seems like
a good idea.

This approach was most recently suggested by Grant Likely.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Grant Likely <grant.likely@secretlab.ca>,
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 18:05:45 -07:00
Sebastian Ott 5a7689fd5b driver core: move uevent call to driver_register
Device driver attribute groups are created after userspace is notified
via an add event. Fix this by moving the kobject_uevent call to
driver_register after the attribute groups are added.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 18:04:25 -07:00
Ming Lei d1c6c030fc driver core: fix shutdown races with probe/remove(v3)
Firstly, .shutdown callback may touch a uninitialized hardware
if dev->driver is set and .probe is not completed.

Secondly, device_shutdown() may dereference a null pointer to cause
oops when dev->driver is cleared after it has been checked in
device_shutdown().

So just hold device lock and its parent lock(if it has) to
fix the races.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 18:04:25 -07:00
Al Viro 79714f72d3 get rid of kern_path_parent()
all callers want the same thing, actually - a kinda-sorta analog of
kern_path_create().  I.e. they want parent vfsmount/dentry (with
->i_mutex held, to make sure the child dentry is still their child)
+ the child dentry.

Signed-off-by Al Viro <viro@zeniv.linux.org.uk>
2012-07-14 16:35:02 +04:00
Rafael J. Wysocki d181b49eb3 PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset
The power/async device sysfs attribute is only used if both
CONFIG_PM_ADVANCED_DEBUG and CONFIG_PM_SLEEP are set, but the code
implementing it doesn't depend on CONFIG_PM_SLEEP.  As a result, a
build warning appears if CONFIG_PM_ADVANCED_DEBUG is set and
CONFIG_PM_SLEEP is not set.

Fix it by adding a #ifdef CONFIG_PM_SLEEP around the code in
question.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-12 22:40:02 +02:00
Rafael J. Wysocki 8e9afafdad PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset
The functions genpd_save_dev() and genpd_restore_dev() are not used
for CONFIG_PM_RUNTIME unset, so move them under an appropriate
#ifdef.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-12 22:39:49 +02:00
Sachin Kamat db79e53dd5 PM / Domains: Replace plain integer with NULL pointer in domain.c file
Fixes the following sparse warning:
drivers/base/power/domain.c:1679:55: warning: Using plain integer as NULL pointer

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-11 12:25:49 +02:00
Sachin Kamat 8951ef0219 PM / Domains: Add missing static storage class specifier in domain.c file
Fixes the folloiwng sparse warning:
drivers/base/power/domain.c:149:5:
warning: symbol '__pm_genpd_poweron' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-10 21:47:07 +02:00
Preeti U Murthy 8651f97bd9 PM / cpuidle: System resume hang fix with cpuidle
On certain bios, resume hangs if cpus are allowed to enter idle states
during suspend [1].

This was fixed in apci idle driver [2].But intel_idle driver does not
have this fix. Thus instead of replicating the fix in both the idle
drivers, or in more platform specific idle drivers if needed, the
more general cpuidle infrastructure could handle this.

A suspend callback in cpuidle_driver could handle this fix. But
a cpuidle_driver provides only basic functionalities like platform idle
state detection capability and mechanisms to support entry and exit
into CPU idle states. All other cpuidle functions are found in the
cpuidle generic infrastructure for good reason that all cpuidle
drivers, irrepective of their platforms will support these functions.

One option therefore would be to register a suspend callback in cpuidle
which handles this fix. This could be called through a PM_SUSPEND_PREPARE
notifier. But this is too generic a notfier for a driver to handle.

Also, ideally the job of cpuidle is not to handle side effects of suspend.
It should expose the interfaces which "handle cpuidle 'during' suspend"
or any other operation, which the subsystems call during that respective
operation.

The fix demands that during suspend, no cpus should be allowed to enter
deep C-states. The interface cpuidle_uninstall_idle_handler() in cpuidle
ensures that. Not just that it also kicks all the cpus which are already
in idle out of their idle states which was being done during cpu hotplug
through a CPU_DYING_FROZEN callbacks.

Now the question arises about when during suspend should
cpuidle_uninstall_idle_handler() be called. Since we are dealing with
drivers it seems best to call this function during dpm_suspend().
Delaying the call till dpm_suspend_noirq() does no harm, as long as it is
before cpu_hotplug_begin() to avoid race conditions with cpu hotpulg
operations. In dpm_suspend_noirq(), it would be wise to place this call
before suspend_device_irqs() to avoid ugly interactions with the same.

Ananlogously, during resume.

References:
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/674075.
[2] http://marc.info/?l=linux-pm&m=133958534231884&w=2

Reported-and-tested-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-10 21:34:49 +02:00
Mark Brown 1044c180de regmap: Add hook for printk logging for debugging during early init
Sometimes for failures during very early init the trace infrastructure
isn't available early enough to be used.  For this sort of problem
defining LOG_DEVICE will add printks for basic register I/O on a specific
device, allowing trace to be extracted when the trace system doesn't come
up early enough to work with.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-07-06 14:16:16 +01:00
Rafael J. Wysocki 62d4490294 PM / Domains: Allow device callbacks to be added at any time
Make it possible to modify device callbacks used by the generic PM
domains core code at any time, not only after the device has been
added to a domain.  This will allow device drivers to provide their
own device PM domain callbacks even if they are registered before
adding the devices to PM domains.

For this purpose, use the observation that the struct
generic_pm_domain_data object containing the relevant callback
pointers may be allocated by pm_genpd_add_callbacks() and the
callbacks may be set before __pm_genpd_add_device() is run for
the given device.  This object will then be used by
__pm_genpd_add_device(), but it has to be protected from
premature removal by reference counting.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-05 22:12:54 +02:00
Rafael J. Wysocki 1d5fcfec22 PM / Domains: Add device domain data reference counter
Add a mechanism for counting references to the
struct generic_pm_domain_data object pointed to by
dev->power.subsys_data->domain_data if the device in question
belongs to a generic PM domain.

This change is necessary for a subsequent patch making it possible to
allocate that object from within pm_genpd_add_callbacks(), so that
drivers can attach their PM domain device callbacks to devices before
those devices are added to PM domains.

This patch has been tested on the SH7372 Mackerel board.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-05 22:12:32 +02:00
Greg Kroah-Hartman 6fbfd0592e Merge v3.5-rc5 into driver-core-next
This picks up the big printk fixes, and resolves a merge issue with:
	drivers/extcon/extcon_gpio.c

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-05 08:25:34 -07:00
Rafael J. Wysocki cbc9ef0287 PM / Domains: Add preliminary support for cpuidle, v2
On some systems there are CPU cores located in the same power
domains as I/O devices.  Then, power can only be removed from the
domain if all I/O devices in it are not in use and the CPU core
is idle.  Add preliminary support for that to the generic PM domains
framework.

First, the platform is expected to provide a cpuidle driver with one
extra state designated for use with the generic PM domains code.
This state should be initially disabled and its exit_latency value
should be set to whatever time is needed to bring up the CPU core
itself after restoring power to it, not including the domain's
power on latency.  Its .enter() callback should point to a procedure
that will remove power from the domain containing the CPU core at
the end of the CPU power transition.

The remaining characteristics of the extra cpuidle state, referred to
as the "domain" cpuidle state below, (e.g. power usage, target
residency) should be populated in accordance with the properties of
the hardware.

Next, the platform should execute genpd_attach_cpuidle() on the PM
domain containing the CPU core.  That will cause the generic PM
domains framework to treat that domain in a special way such that:

 * When all devices in the domain have been suspended and it is about
   to be turned off, the states of the devices will be saved, but
   power will not be removed from the domain.  Instead, the "domain"
   cpuidle state will be enabled so that power can be removed from
   the domain when the CPU core is idle and the state has been chosen
   as the target by the cpuidle governor.

 * When the first I/O device in the domain is resumed and
   __pm_genpd_poweron(() is called for the first time after
   power has been removed from the domain, the "domain" cpuidle
   state will be disabled to avoid subsequent surprise power removals
   via cpuidle.

The effective exit_latency value of the "domain" cpuidle state
depends on the time needed to bring up the CPU core itself after
restoring power to it as well as on the power on latency of the
domain containing the CPU core.  Thus the "domain" cpuidle state's
exit_latency has to be recomputed every time the domain's power on
latency is updated, which may happen every time power is restored
to the domain, if the measured power on latency is greater than
the latency stored in the corresponding generic_pm_domain structure.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Kevin Hilman <khilman@ti.com>
2012-07-03 19:07:42 +02:00
Rafael J. Wysocki 80de3d7f41 PM / Domains: Do not stop devices after restoring their states
While resuming a device belonging to a PM domain,
pm_genpd_runtime_resume() calls __pm_genpd_restore_device() to
restore its state, if necessary.  The latter starts the device,
using genpd_start_dev(), restores its state, using
genpd_restore_dev(), and then stops it, using genpd_stop_dev().
However, this last operation is not necessary, because the
device is supposed to be operational after pm_genpd_runtime_resume()
has returned and because of it pm_genpd_runtime_resume() has to
call genpd_start_dev() once again for the "restored" device, which
is inefficient.

To make things more efficient, remove the call to genpd_stop_dev()
from __pm_genpd_restore_device() and the direct call to
genpd_start_dev() from pm_genpd_runtime_resume().  [Of course,
genpd_start_dev() still has to be called by it for devices with the
power.irq_safe flag set, because __pm_genpd_restore_device() is not
executed for them.]

This change has been tested on the SH7372 Mackerel board.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-01 13:31:29 +02:00
Rafael J. Wysocki 0b589741b8 PM / Domains: Use subsystem runtime suspend/resume callbacks by default
Currently, the default "save state" and "restore state" routines
for generic PM domains, pm_genpd_default_save_state() and
pm_genpd_default_restore_state(), respectively, only use runtime PM
callbacks provided by device drivers, but in general those callbacks
need not provide the entire necessary functionality.  Namely, in
general it may be necessary to execute subsystem (i.e. device type,
device class or bus type) callbacks that will carry out all of the
necessary operations.

For this reason, modify pm_genpd_default_save_state() and
pm_genpd_default_restore_state() to execute subsystem callbacks,
if they are provided, and fall back to driver callbacks otherwise.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-01 13:31:29 +02:00
Rafael J. Wysocki b2df1d4f8b PM / Sleep: Separate printing suspend times from initcall_debug
Change the behavior of the newly introduced
/sys/power/pm_print_times attribute so that its initial value
depends on initcall_debug, but setting it to 0 will cause device
suspend/resume times not to be printed, even if initcall_debug has
been set.  This way, the people who use initcall_debug for reasons
other than PM debugging will be able to switch the suspend/resume
times printing off, if need be.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-01 13:31:23 +02:00
Sameer Nanda 4b7760ba0d PM / Sleep: add knob for printing device resume times
Added a new knob called /sys/power/pm_print_times. Setting it to 1
enables printing of time taken by devices to suspend and resume.
Setting it to 0 disables this printing (unless overridden by
initcall_debug kernel command line option).

Signed-off-by: Sameer Nanda <snanda@chromium.org>
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-01 13:31:22 +02:00