tree 899a48d29daebb6e2eb9398797304985e5961fc8
parent 34b087e48367c252e343c2f8de65676a78af1e4a
author Oleg Nesterov <oleg@redhat.com> 1322069297 -0800
committer Tejun Heo <tj@kernel.org> 1322069297 -0800

freezer: fix wait_event_freezable/__thaw_task races

wait_event_freezable() and friends stop the waiting if try_to_freeze()
fails. This is not right, we can race with __thaw_task() and in this
case

	- wait_event_freezable() returns the wrong ERESTARTSYS

	- wait_event_freezable_timeout() can return the positive
	  value while condition == F

Change the code to always check __retval/condition before return.

Note: with or without this patch the timeout logic looks strange,
probably we should recalc timeout if try_to_freeze() returns T.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>