A stack trace is an invaluable tool in determining the basis
and cause of PHY regs read/write failures.
Include PHY reg addr (and value for writes) in the diagnostic.
[Stefan R: changed whitespace]
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Many of the error messages possible from bus_reset_work() do not
contain enough information to distinguish which error condition
occurred nor enough information to evaluate the error afterwards.
Differentiate all error conditions in bus_reset_work(); add
additional information to make error diagnosis possible.
[Stefan R: fixed self-ID endian conversion]
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Convert dev_xxxx(ohci->card.device, ...) log functions to
ohci_xxxx(ohci, ...).
[Stefan R: Peter argues that this increases readability of the code.]
[Stefan R: changed whitespace]
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Add quirk for VT6306 wake bit behavior.
VT6306 seems to reread the wrong descriptor when the wake bit is
written. work around by putting a copy of the branch address in the
first descriptor of the block.
[Stefan R: This fixes the known broken video reception via gstreamer
on VIA VT6306. 100% repeatable testcase:
$ gst-launch-0.10 dv1394src \! dvdemux \! dvdec \! xvimagesink
with a camcorder or other DV source connected. Likewise for MPEG2-TS
reception via gstreamer, e.g. from TV settop boxes.
Perhaps this also fixes dv4l on VT6306, but this is as yet untested.
Kino, dvgrab or FFADO had not been affected by this chip quirk.
Additional comments from Andy:]
I've looked into some problems with the wake bit on a vt6306 family
chip (1106:3044, rev 46).
I used this firewire card in a mythtv setup (ISO receive MPEG2 stream)
with Debian 2.6.32 kernels for ~2 years without problems.
Since upgrading to 3.2, I've been having problems with the input stream
freezing -- input data stops until I restart mythtv (I expect closing
and reopening the device would be sufficient). This happens
infrequently, maybe one out of 20 recordings. I eventually determined
that the problem is more likely to occur if the system is loaded.
I isolated the kernel version as the triggering SW factor and then
specifically the change from dualbuffer back to packet-per-buffer DMA
mode.
The possibility that the controller does not properly respond to the
wake bit was suggested in
https://bugzilla.redhat.com/show_bug.cgi?id=415841, but not proven.
Based on the fact that dualbuffer mode worked while packet-per-buffer
has trouble, I guessed that upon seeing the wake bit written, the vt6306
controller only checks the branch address in the first descriptor of the
block, even if that is not the correct place to look (because the block
has multiple descriptors).
This theory seems to be correct. When the ISO reception is hung, I am
able to resume it by manually writing the branch address to the first
descriptor in the block, and then writing the wake bit.
I've had luck so far with the attached patch, so I'm including it. It's
probably not a complete solution -- I haven't tested transmit modes to
see whether they have a similar issue.
I doubt that the quirk test is any cheaper than just writing the extra
branch address in all cases, but it does reduce the risk of breaking
other hardware.
[Stefan R: omitted QUIRK_NO_MSI from VT6306 quirks table entry,
changed whitespace]
Signed-off-by: Andy Leiserson <andy@leiserson.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
A pci device can be removed while in its suspended state. If the ohci
host controller is suspended, the PHY is also in low-power mode and
LPS is disabled. If LPS is disabled, most of the host registers aren't
accessible, including IntMaskClear. Furthermore, access to these registers
when LPS is disabled can cause hard lockups on some hardware. Since
interrupts are already disabled in this mode, further action is
unnecessary.
Test LPS before attempting to write IntMaskClear to disable interrupts.
[Stefan R: whitespace changes]
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
A pci device can be removed while in its suspended state.
Because the ohci driver freed the irq to suspend, free_irq() is
called twice; once from pci_remove() and again from pci_suspend(),
which issues the warning below [1].
Rather than allocate the irq in the .enable() path, move the
allocation to .probe(). Consequently, the irq is not reallocated
upon pci_resume() and thus is not freed upon pci_suspend().
[1] Warning reported by Mark Einon <mark.einon@gmail.com> when
suspending an MSI MS-1727 GT740 laptop on Ubuntu 3.5.0-22-generic
WARNING: at ./kernel/irq/manage.c:1198 __free_irq+0xa3/0x1e0()
Hardware name: MS-1727
Trying to free already-free IRQ 16
Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables <...snip...>
Pid: 4, comm: kworker/0:0 Tainted: P O 3.5.0-22-generic #34-Ubuntu
Call Trace:
[<ffffffff81051c1f>] warn_slowpath_common+0x7f/0xc0
[<ffffffff81051d16>] warn_slowpath_fmt+0x46/0x50
[<ffffffff8103fa39>] ? default_spin_lock_flags+0x9/0x10
[<ffffffff810df6b3>] __free_irq+0xa3/0x1e0
[<ffffffff810df844>] free_irq+0x54/0xc0
[<ffffffffa005a27e>] pci_remove+0x6e/0x210 [firewire_ohci]
[<ffffffff8135ae7f>] pci_device_remove+0x3f/0x110
[<ffffffff8141fdbc>] __device_release_driver+0x7c/0xe0
[<ffffffff8141fe4c>] device_release_driver+0x2c/0x40
[<ffffffff8141f5f1>] bus_remove_device+0xe1/0x120
[<ffffffff8141cd1a>] device_del+0x12a/0x1c0
[<ffffffff8141cdc6>] device_unregister+0x16/0x30
[<ffffffff81354784>] pci_stop_bus_device+0x94/0xa0
[<ffffffffa0091c67>] acpiphp_disable_slot+0xb7/0x1a0 [acpiphp]
[<ffffffffa0090716>] ? get_slot_status+0x46/0xc0 [acpiphp]
[<ffffffffa0091d7d>] acpiphp_check_bridge.isra.15+0x2d/0xf0 [acpiphp]
[<ffffffffa0092442>] _handle_hotplug_event_bridge+0x372/0x4d0 [acpiphp]
[<ffffffff81390f8c>] ? acpi_os_execute_deferred+0x2f/0x34
[<ffffffff8116e22d>] ? kfree+0xed/0x110
[<ffffffff8107086a>] process_one_work+0x12a/0x420
[<ffffffffa00920d0>] ? _handle_hotplug_event_func+0x1d0/0x1d0 [acpiphp]
[<ffffffff8107141e>] worker_thread+0x12e/0x2f0
[<ffffffff810712f0>] ? manage_workers.isra.26+0x200/0x200
[<ffffffff81075f13>] kthread+0x93/0xa0
[<ffffffff8168d024>] kernel_thread_helper+0x4/0x10
[<ffffffff81075e80>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff8168d020>] ? gs_change+0x13/0x13
Reported-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The old IEEE 1394 driver stack was removed in v2.6.37. That made the
checks for two Kconfig (module) macros unneeded, since they will now
always evaluate to true. Remove these two checks.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Pull trivial branch from Jiri Kosina:
"Usual stuff -- comment/printk typo fixes, documentation updates, dead
code elimination."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
HOWTO: fix double words typo
x86 mtrr: fix comment typo in mtrr_bp_init
propagate name change to comments in kernel source
doc: Update the name of profiling based on sysfs
treewide: Fix typos in various drivers
treewide: Fix typos in various Kconfig
wireless: mwifiex: Fix typo in wireless/mwifiex driver
messages: i2o: Fix typo in messages/i2o
scripts/kernel-doc: check that non-void fcts describe their return value
Kernel-doc: Convention: Use a "Return" section to describe return values
radeon: Fix typo and copy/paste error in comments
doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c
various: Fix spelling of "asynchronous" in comments.
Fix misspellings of "whether" in comments.
eisa: Fix spelling of "asynchronous".
various: Fix spelling of "registered" in comments.
doc: fix quite a few typos within Documentation
target: iscsi: fix comment typos in target/iscsi drivers
treewide: fix typo of "suport" in various comments and Kconfig
treewide: fix typo of "suppport" in various comments
...
CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
"Asynchronous" is misspelled in some comments. No code changes.
Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
In case of a self constructed selfID packet this patch correctly
determines the information if the TSB41BA3D phy initiated a bus reset.
Signed-off-by: Stephan Gatzka <stephan.gatzka@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
OHCI 1.1 says:
| Since the value of this bit is undefined after reset in all IR
| contexts, software shall initialize this bit to zero in all contexts
| whether or not active to maintain the exclusive nature of this bit.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
pci_request_region() does not fail on resources that have not been
allocated by the BIOS or by the kernel, so to avoid accessing
registers that are not there, we have to check for this explicitly.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The Bus_Time CSR is virtually never used, so we can avoid burning CPU in
interrupt context for 1 or 3 IsochronousCycleTimer accesses every minute
by not tracking the bus time until the CSR is actually accessed for the
first time.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
bus_reset_work() is only called from workqueue thread context.
ohci_set_config_rom() and ohci_allocate_iso_context() perform GFP_KERNEL
memory allocations, therefore they must be called with interrupts
enabled.
Hence these functions may disable and enable local IRQs without having
to track IRQ state.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This patch converts the drivers in drivers/firewire/* to use module_pci_driver()
macro which makes the code smaller and a bit simpler.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Remove all #inclusions of asm/system.h preparatory to splitting and killing
it. Performed with the following command:
perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *`
Signed-off-by: David Howells <dhowells@redhat.com>
- Some SBP-2 initiator fixes, side product from ongoing work on a target.
- Reintroduction of an isochronous I/O feature of the older ieee1394 driver
stack (flush buffer completions); it was evidently rarely used but not
actually unused. Matching libraw1394 code is already available.
- Be sure to prefix all kernel log messages with device name or card name,
and other logging related cleanups.
- Misc other small cleanups, among them a small API change that affects
sound/firewire/ too.
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Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
Pull IEEE 1394 (FireWire) subsystem updates post v3.3 from Stefan Richter:
- Some SBP-2 initiator fixes, side product from ongoing work on a target.
- Reintroduction of an isochronous I/O feature of the older ieee1394 driver
stack (flush buffer completions); it was evidently rarely used but not
actually unused. Matching libraw1394 code is already available.
- Be sure to prefix all kernel log messages with device name or card name,
and other logging related cleanups.
- Misc other small cleanups, among them a small API change that affects
sound/firewire/ too. Clemens Ladisch is aware of it.
* tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: (26 commits)
firewire: allow explicit flushing of iso packet completions
firewire: prevent dropping of completed iso packet header data
firewire: ohci: factor out iso completion flushing code
firewire: ohci: simplify iso header pointer arithmetic
firewire: ohci: optimize control bit checks
firewire: ohci: remove unused excess_bytes field
firewire: ohci: copy_iso_headers(): make comment match the code
firewire: cdev: fix IR multichannel event documentation
firewire: ohci: fix too-early completion of IR multichannel buffers
firewire: ohci: move runtime debug facility out of #ifdef
firewire: tone down some diagnostic log messages
firewire: sbp2: replace a GFP_ATOMIC allocation
firewire: sbp2: Fix SCSI sense data mangling
firewire: sbp2: Ignore SBP-2 targets on the local node
firewire: sbp2: Take into account Unit_Unique_ID
firewire: nosy: Use the macro DMA_BIT_MASK().
firewire: core: convert AR-req handler lock from _irqsave to _bh
firewire: core: fix race at address_handler unregistration
firewire: core: remove obsolete comment
firewire: core: prefix log messages with card name
...
Extend the kernel and userspace APIs to allow reporting all currently
completed isochronous packets, even if the next interrupt packet has not
yet been reached. This is required to determine the status of the
packets at the end of a paused or stopped stream, and useful for more
precise synchronization of audio streams.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The buffer for the header data of completed iso packets has a fixed
size, so it is possible to configure a stream with a big interval
between interrupt packets or with big headers so that this buffer would
overflow. Previously, ohci.c would drop any data that would not fit,
but this could make unsuspecting applications believe that fewer than
the actual number of packets have completed.
Instead of dropping data, add calls to flush_iso_completion() so that
there are as many events as needed to report all of the data.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
In preparation for the following patches that add more flushing, move
the code for flushing accumulated header data into a common function.
The timestamp of the last completed packed is passed through the context
structure instead of a function parameter to allow accessing this value
later outside of the handle_i?_packet functions.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
When storing the header data of completed iso packets, we effectively
treat the buffers as arrays of quadlets. Actually declaring the
pointers as u32* avoids repetitive pointer arithmetic, removes the
unhelpfully named "i" variables, and thus makes the code clearer.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Doing the endian conversion on the constant instead of the memory
field allows the compiler to do the conversion at compile time.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Commit 6498ba04ae (remove unused dualbuffer IR code) overlooked
a field in struct iso_context.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The comment incorrectly talked about one little-endian quadlet, while
there are actually two. Furthermore, the endianness of the remaining
headers depends on whatever protocol is used, so don't mention them.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
handle_ir_buffer_fill() assumed that a completed descriptor would be
indicated by a non-zero transfer_status (as in most other descriptors).
However, this field is written by the controller as soon as (the end of)
the first packet has been written into the buffer. As a consequence, if
we happen to run into such a descriptor when the interrupt handler is
executed after such a packet has completed, the descriptor would be
taken out of the list of active descriptors as soon as the buffer had
been partially filled, so the event for the buffer being completely
filled would never be sent.
To fix this, handle descriptors only when they have been completely
filled, i.e., when res_count == 0. (This also matches the condition
that is reported by the controller with an interrupt.)
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: 2.6.36+ <stable@vger.kernel.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
CONFIG_FIREWIRE_OHCI_DEBUG could have been exposed to kernel tweakers
if CONFIG_EXPERT was set. But in hindsight, this stuff is far too
useful to omit it. So get rid of two #else branches that are only
going to bitrot otherwise.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The PCIe device
FireWire (IEEE 1394) [0c00]: Ricoh Co Ltd FireWire Host Controller
[1180:e832] (prog-if 10 [OHCI])
is unable to access attached FireWire devices when MSI is enabled but
works if MSI is disabled.
http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg28251.html
Hence add the "disable MSI" quirks flag for this device, or in fact for
safety and simplicity for all current (R5U230, R5U231, R5U240) and
future Ricoh PCIe 1394 controllers.
Reported-by: Stefan Thomas <kontrapunktstefan@googlemail.com>
Cc: 2.6.36+ <stable@vger.kernel.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
The Audigy's SB1394 controller is actually from Texas Instruments
and has the same bus reset packet generation bug, so it needs the
same quirk entry.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: 2.6.36+ <stable@vger.kernel.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Add the dma_sync_single_* calls necessary to ensure proper cache
synchronization for isochronous data buffers on non-coherent
architectures.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
If a device's firmware initiates a bus reset by setting the IBR bit in
PHY register 1 without resetting the gap count field to 63 (and without
having sent a PHY configuration packet beforehand), the gap count of
this node will remain at the old value after the bus reset and thus be
inconsistent with the gap count on all other nodes.
The bus manager is supposed to detect the inconsistent gap count values
in the self ID packets and correct them by issuing another bus reset.
However, if the buggy device happens to be the cycle master, and if it
sends a cycle start packet immediately after the bus reset (which is
likely after a long bus reset), then the time between the end of the
selfID phase and the start of the cycle start packet will be based on
the too-small gap count value, so this gap will be too short to be
detected as a subaction gap by the other nodes. This means that the
cycle start packet will be assumed to be self ID data, and will be
stored after the actual self ID quadlets in the self ID buffer.
This garbage in the self ID buffer made firewire-core ignore all of the
self ID data, and thus prevented the Linux bus manager from correcting
the problem. Furthermore, because the bus reset handling was aborted
completely, asynchronous transfers would be no longer handled correctly,
and fw_run_transaction() would hang until the next bus reset.
To fix this, make the detection of inconsistent self IDs more
discriminating: If the invalid data in the self ID buffer looks like
a cycle start packet, we can assume that the previous data in the buffer
is correctly received self ID information, and process it normally.
(We inspect only the first quadlet of the cycle start packet, because
this value is different enough from any valid self ID quadlet, and many
controllers do not store the cycle start packet in five quadlets because
they expect self ID data to have an even number of quadlets.)
This bug has been observed when a bus-powered DesktopKonnekt6 is
switched off with its power button.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Change memory region to ohci "middle address space". This effectively
reduces the number of packets by 50%.
[Stefan R.:] This eliminates 1394 ack packets and improved throughput
by a few percent in some tests with an S400a connection with and without
gap count optimization. Since firewire-net taxes the AR-req DMA unit of
a FireWire controller much more than firewire-sbp2 (which uses the
middle address space with PCI posted writes too), this commit also
changes a related error printk into a ratelimited one as a precaution.
Side note: The IPv4-over-1394 drivers of Mac OS X 10.4, Windows XP SP3,
and the Thesycon 1394 bus driver for Windows all use the middle address
space too.
Signed-off-by: Stephan Gatzka <stephan@gatzka.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Takes less source code and machine code, and less runtime with PHYs
other than TSB41BA3D (e.g. TSB81BA3 with device ID 0x831304 which takes
one instead of six read_paged_phy_reg now).
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Fix: phy_reg_mutex must be held over the write/read_phy_reg pair which
gets PHY port status.
Only print to the log when a TSB41BA3D was found. By far most TSB82AA2
cards have a TSB81BA3, and firewire-ohci can keep quiet about that.
Shorten some strings and comments. Change some whitespace.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This patch implements a work around for the Texas Instruments PHY
TSB41BA3D. This phy has a bug at least in combination with the TI LLCs
TSB82AA2B and TSB12LV26. The selfid coming from the locally connected
phy is not propagated into the selfid buffer of the OHCI (see
http://www.ti.com/litv/pdf/sllz059 for details). The main idea is to
construct the selfid ourselves.
Signed-off-by: Stephan Gatzka <stephan@gatzka.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Code inside bus_reset_work may now sleep. This is a prerequisite to
support a phy from Texas Instruments cleanly. The patch to support this
phy will be submitted later.
Signed-off-by: Stephan Gatzka <stephan@gatzka.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This fixes https://bugs.launchpad.net/ubuntu/+source/linux/+bug/801719 .
An O2Micro PCI Express FireWire controller,
"FireWire (IEEE 1394) [0c00]: O2 Micro, Inc. Device [1217:11f7] (rev 05)"
which is a combination device together with an SDHCI controller and some
sort of storage controller, misses SBP-2 status writes from an attached
FireWire HDD. This problem goes away if MSI is disabled for this
FireWire controller.
The device reportedly does not require QUIRK_CYCLE_TIMER.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (amended changelog)
Cc: <stable@kernel.org>
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
firewire: ohci: fix DMA unmapping in an error path
firewire: cdev: fix 32 bit userland on 64 bit kernel compat corner cases
If request_irq failed, we would pass wrong arguments to
dma_free_coherent. https://bugzilla.redhat.com/show_bug.cgi?id=728185
Reported-by: Mads Kiilerich
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
When firewire-ohci is bound to a Pinnacle MovieBoard, eventually a
"Register access failure" is logged and an interrupt storm or a kernel
panic happens. https://bugzilla.kernel.org/show_bug.cgi?id=36622
Until this is sorted out (if that is going to succeed at all), let's
just prevent firewire-ohci from touching these devices.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: <stable@kernel.org>
The software reset in firewire-ohci's pci_remove does not have a great
prospect of success if the card was already physically removed at this
point. So let's skip the 500 ms that were spent in retries here.
Also, replace a defined constant by its open-coded value. This is not a
constant from a specification but an arbitrarily chosen retry limit. It
was only used in this single place.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Detect and handle ejection of FireWire CardBus cards in PHY register
accesses:
- The last attempt of firewire-core to reset the bus during shutdown
caused a spurious "firewire_ohci: failed to write phy reg" error
message in the log. Skip this message as well as the prior retry
loop that needlessly took 100 milliseconds.
- In the unlikely case that a PHY register was read right after card
ejection, a bogus value was obtained and possibly acted upon.
Instead, fail the read attempt.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Peter Hurley