]> git.karo-electronics.de Git - linux-beck.git/commit
lockdep: check that no locks held at freeze time
authorMandeep Singh Baines <msb@chromium.org>
Thu, 28 Feb 2013 01:03:18 +0000 (17:03 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 28 Feb 2013 03:10:11 +0000 (19:10 -0800)
commit6aa9707099c4b25700940eb3d016f16c4434360d
tree6996f5789a3c0a09eea2fe57d318c1d387c24f3a
parentc2c1b089b44b783bd50fae4bccaa6f367f92e492
lockdep: check that no locks held at freeze time

We shouldn't try_to_freeze if locks are held.  Holding a lock can cause a
deadlock if the lock is later acquired in the suspend or hibernate path
(e.g.  by dpm).  Holding a lock can also cause a deadlock in the case of
cgroup_freezer if a lock is held inside a frozen cgroup that is later
acquired by a process outside that group.

[akpm@linux-foundation.org: export debug_check_no_locks_held]
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Cc: Ben Chan <benchan@chromium.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/debug_locks.h
include/linux/freezer.h
kernel/exit.c
kernel/lockdep.c