Srivatsa S. Bhat 72081624d5 PM / Hibernate: Rewrite unlock_system_sleep() to fix s2disk regression ... Commit 33e638b, "PM / Sleep: Use the freezer_count() functions in [un]lock_system_sleep() APIs" introduced an undesirable change in the behaviour of unlock_system_sleep() since freezer_count() internally calls try_to_freeze() - which we don't need in unlock_system_sleep(). And commit bcda53f, "PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()" made these APIs wide-spread. This caused a regression in suspend-to-disk where snapshot_read() and snapshot_write() were getting frozen due to the try_to_freeze embedded in unlock_system_sleep(), since these functions were invoked when the freezing condition was still in effect. Fix this by rewriting unlock_system_sleep() by open-coding freezer_count() and dropping the try_to_freeze() part. Not only will this fix the regression but this will also ensure that the API only does what it is intended to do, and nothing more, under the hood. While at it, make the code more correct and robust by ensuring that the PF_FREEZER_SKIP flag gets cleared with pm_mutex held, to avoid a race with the freezer. Also, to be on the safer side, open-code freezer_do_not_count() as well (inside lock_system_sleep()), to ensure that any unrelated modification to freezer[_do_not]_count() does not break things again! Reported-and-tested-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>		2012-01-19 23:25:33 +01:00
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acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-01-18 15:51:48 -08:00
asm-generic	Merge branch 'for-next' of git://git.infradead.org/users/dhowells/linux-headers	2012-01-14 18:03:30 -08:00
crypto
drm	drm: bump DRM_CONNECTOR_MAX_ENCODER from 2 to 3	2012-01-13 09:01:09 +00:00
keys
linux	PM / Hibernate: Rewrite unlock_system_sleep() to fix s2disk regression	2012-01-19 23:25:33 +01:00
math-emu
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-01-18 12:53:54 -08:00
misc
mtd	mtd: document that MEMWRITE ioctl is NAND-specific	2012-01-09 18:18:36 +00:00
net	net: fix some sparse errors	2012-01-17 10:31:12 -05:00
pcmcia
rdma	rdma/core: Fix sparse warnings	2012-01-04 09:17:45 -08:00
rxrpc
scsi	[SCSI] libfc: Declare local functions static	2012-01-16 12:45:48 +04:00
sound	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound	2012-01-12 08:00:30 -08:00
target	target: Set additional sense length field in sense data	2011-12-16 06:29:04 +00:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2012-01-17 15:49:54 -08:00
video	Merge branch 'for-next' of git://git.infradead.org/users/dhowells/linux-headers	2012-01-14 18:03:30 -08:00
xen	Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block	2012-01-15 12:48:41 -08:00
Kbuild