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OpenCloudOS-Kernel
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Guo Chao 5370019dc2 loopdev: fix a deadlock 
bd_mutex and lo_ctl_mutex can be held in different order.

Path #1:

blkdev_open
 blkdev_get
  __blkdev_get (hold bd_mutex)
   lo_open (hold lo_ctl_mutex)

Path #2:

blkdev_ioctl
 lo_ioctl (hold lo_ctl_mutex)
  lo_set_capacity (hold bd_mutex)

Lockdep does not report it, because path #2 actually holds a subclass of
lo_ctl_mutex.  This subclass seems creep into the code by mistake.  The
patch author actually just mentioned it in the changelog, see commit
f028f3b2 ("loop: fix circular locking in loop_clr_fd()"), also see:

	http://marc.info/?l=linux-kernel&m=123806169129727&w=2

Path #2 hold bd_mutex to call bd_set_size(), I've protected it
with i_mutex in a previous patch, so drop bd_mutex at this site.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Guo Chao <yan@linux.vnet.ibm.com>
Cc: M. Hindess <hindessm@uk.ibm.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2013-02-22 10:43:21 +01:00
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accessibility
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acpi Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-01-31 17:08:43 +11:00
amba Drivers: amba: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
ata [libata] replace sata_settings with devslp_timing 2013-01-14 13:29:15 -05:00
atm atm/iphase: rename fregt_t -> ffreg_t 2013-02-08 14:22:05 -05:00
auxdisplay Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
base Merge remote-tracking branch 'regmap/fix/debugfs' into tmp 2013-01-24 19:04:16 +08:00
bcma Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-02-06 13:55:44 -05:00
block loopdev: fix a deadlock 2013-02-22 10:43:21 +01:00
bluetooth Bluetooth device 04ca:3008 should use ath3k 2013-01-10 02:51:03 -02:00
bus Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
cdrom Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
char virtio_console: Don't access uninitialized data. 2013-02-07 11:37:37 +10:30
clk mvebu fixes for v3.8-rc5 2013-01-23 20:30:52 -08:00
clocksource Drivers: clocksource: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
connector Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
cpufreq cpufreq: Add module aliases for acpi-cpufreq 2013-01-22 22:33:46 +01:00
cpuidle cpuidle: remove the power_specified field in the driver 2013-01-15 14:18:04 +01:00
crypto Drivers: crypto: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
dca
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devfreq PM / devfreq: exynos4_bus: honor RCU lock usage 2013-01-22 13:28:40 +01:00
dio
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dma Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2013-01-24 10:17:49 -08:00
edac EDAC: Fix kcalloc argument order 2013-01-30 11:38:25 +01:00
eisa
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extcon
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firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
firmware Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-01-31 17:10:36 +11:00
gpio gpio: mvebu: Don't free chip label memory 2013-01-17 12:27:08 +01:00
gpu drm/ttm: fix fence locking in ttm_buffer_object_transfer, 2nd try 2013-02-08 10:44:31 +10:00
hid Merge branch 'for-3.8/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-02-01 08:44:59 +11:00
hsi Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
hv Drivers: hv: balloon: Fix a memory leak 2013-01-17 11:58:00 -08:00
hwmon hwmon: (vexpress) Fix build error seen if CONFIG_OF_DEVICE is not set 2013-01-09 21:47:22 -08:00
hwspinlock
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i2c i2c-designware: add missing MODULE_LICENSE 2013-01-22 16:43:34 +01:00
ide Drivers: ide: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
idle intel_idle: Don't register CPU notifier if we are not running. 2013-01-18 13:43:43 +01:00
iio Staging fixes for 3.8-rc3 2013-01-14 09:08:38 -08:00
infiniband Merge branches 'ipoib', 'mlx4' and 'qib' into for-next 2013-02-05 09:45:25 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-01-04 10:30:11 -08:00
iommu Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-01-30 12:02:26 +11:00
ipack TTY/Serial merge for 3.8-rc1 2012-12-11 14:08:47 -08:00
irqchip ARM: arm-soc: Device-tree updates, take 2 2012-12-14 14:42:53 -08:00
isdn isdn/gigaset: fix zero size border case in debug dump 2013-01-21 17:36:02 -05:00
leds leds: leds-gpio: set devm_gpio_request_one() flags param correctly 2013-01-02 17:58:41 -08:00
lguest lguest: fix typo 2012-12-18 15:19:06 +10:30
macintosh Drivers: macintosh: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
md A fix for stacked dm thin devices and a fix for the new dm WRITE SAME 2013-02-01 12:04:22 +11:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2013-02-06 08:36:12 +11:00
memory Drivers: memory: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
memstick
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message Drivers: message: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
mfd This is the first pull request for MFD fixes for 3.8 2013-01-28 11:51:57 -08:00
misc Revert "drivers/misc/ti-st: remove gpio handling" 2013-01-22 17:22:47 -08:00
mmc This is the first pull request for MFD fixes for 3.8 2013-01-28 11:51:57 -08:00
mtd A small set of simple regression and build fixes for 3.8: 2013-02-05 07:54:11 +11:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-02-09 07:55:24 +11:00
nfc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
nubus
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of of: Fix export of of_find_matching_node_and_match() 2012-12-19 10:58:53 +00:00
oprofile
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parisc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
parport Drivers: parport: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
pci PCI updates for v3.8: 2013-01-22 16:36:23 -08:00
pcmcia ARM: arm-soc: Header cleanups 2012-12-12 11:45:16 -08:00
pinctrl pinctrl: sirf: replace of_gpio_simple_xlate by sirf specific of_xlate 2013-02-05 15:27:39 +01:00
platform samsung-laptop: Disable on EFI hardware 2013-01-30 11:52:11 -08:00
pnp PNP: Handle IORESOURCE_BITS in resource allocation 2013-01-03 13:10:53 +01:00
power ARM: arm-soc fixes for 3.8-rc 2013-01-08 18:53:56 -08:00
pps Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
ps3 Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
ptp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-12-12 18:07:07 -08:00
pwm pwm: Changes for v3.8-rc1 2012-12-19 08:19:07 -08:00
rapidio Driver core updates for 3.8-rc1 2012-12-11 13:13:55 -08:00
regulator Merge remote-tracking branch 'regulator/fix/tps65910' into tmp 2013-02-06 11:28:53 +00:00
remoteproc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
rpmsg Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
rtc drivers/rtc/rtc-pl031.c: fix the missing operation on enable 2013-02-05 20:38:49 +11:00
s390 s390/chsc: fix SEI usage 2013-01-16 15:57:54 +01:00
sbus Drivers: sbus: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
scsi efi: Make 'efi_enabled' a function to query EFI facilities 2013-01-30 11:51:59 -08:00
sfi
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sh sh: clkfwk: bugfix: sh_clk_div_enable() care sh_clk_div_set_rate() if div6 2013-01-11 20:57:58 +09:00
sn Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
spi spi/sh-hspi: fix return value check in hspi_probe(). 2012-12-19 15:11:41 +00:00
ssb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-02-06 13:55:44 -05:00
staging Staging bugfixes for 3.8-rc4 2013-01-18 14:05:25 -08:00
target target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices 2013-01-31 15:22:53 -08:00
tc
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thermal Drivers: thermal: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
tty 8250/16?50: Add support for Broadcom TruManage redirected serial port 2013-01-17 14:02:55 -08:00
uio ARM: arm-soc: SoC updates for 3.8 2012-12-12 12:05:15 -08:00
usb USB: storage: optimize to match the Huawei USB storage devices and support new switch command 2013-02-04 10:41:40 -08:00
uwb
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vfio vfio-pci: Fix buffer overfill 2013-01-15 10:45:26 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-02-09 07:55:24 +11:00
video This is yet another critical imxfb fixes held off by absence of FB 2013-01-23 20:35:02 -08:00
virt Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-12-18 09:58:09 -08:00
virtio Drivers: virtio: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
vlynq Drivers: vlynq: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
vme
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w1 Drivers: w1: remove last __devexit_p() instance 2013-01-03 15:57:01 -08:00
watchdog watchdog: twl4030_wdt: add DT support 2013-01-02 12:07:05 +01:00
xen Two fixes: 2013-02-08 11:55:27 +11:00
zorro Drivers: zorro: remove CONFIG_HOTPLUG usage 2013-01-03 15:57:01 -08:00
Kconfig
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Makefile
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