Rafael J. Wysocki 181e9bdef3 PM / Hibernate: Fix s2disk regression related to freezing workqueues ... Commit 2aede851dd PM / Hibernate: Freeze kernel threads after preallocating memory introduced a mechanism by which kernel threads were frozen after the preallocation of hibernate image memory to avoid problems with frozen kernel threads not responding to memory freeing requests. However, it overlooked the s2disk code path in which the SNAPSHOT_CREATE_IMAGE ioctl was run directly after SNAPSHOT_FREE, which caused freeze_workqueues_begin() to BUG(), because it saw that worqueues had been already frozen. Although in principle this issue might be addressed by removing the relevant BUG_ON() from freeze_workqueues_begin(), that would reintroduce the very problem that commit 2aede851dd attempted to avoid into that particular code path. For this reason, to fix the issue at hand, introduce thaw_kernel_threads() and make the SNAPSHOT_FREE ioctl execute it. Special thanks to Srivatsa S. Bhat for detailed analysis of the problem. Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: stable@kernel.org		2012-01-29 20:35:52 +01:00
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Kconfig	Merge branch 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm	2011-10-28 12:02:27 -07:00
Makefile	PM / VT: Cleanup #if defined uglyness and fix compile error	2011-10-16 23:28:51 +02:00
block_io.c	block: kill off REQ_UNPLUG	2011-03-10 08:52:27 +01:00
console.c	PM / VT: Cleanup #if defined uglyness and fix compile error	2011-10-16 23:28:51 +02:00
hibernate.c	PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()	2011-12-08 23:22:29 +01:00
main.c	PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()	2011-12-08 23:22:29 +01:00
power.h	PM / Hibernate: Thaw processes in SNAPSHOT_CREATE_IMAGE ioctl test path	2011-12-06 22:07:59 +01:00
poweroff.c	Input: sysrq - drop tty argument from sysrq ops handlers	2010-08-19 22:07:06 -07:00
process.c	PM / Hibernate: Fix s2disk regression related to freezing workqueues	2012-01-29 20:35:52 +01:00
qos.c	PM / QoS: Set cpu_dma_pm_qos->name	2011-11-07 23:02:24 +01:00
snapshot.c	PM / Hibernate: Correct additional pages number calculation	2012-01-19 23:23:10 +01:00
suspend.c	PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()	2011-12-08 23:22:29 +01:00
suspend_test.c	PM: Make warning in suspend_test_finish() less likely to happen	2009-10-22 08:23:45 +09:00
swap.c	PM / Hibernate: Drop the check of swap space size for compressed image	2012-01-14 00:41:37 +01:00
user.c	PM / Hibernate: Fix s2disk regression related to freezing workqueues	2012-01-29 20:35:52 +01:00