From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 23 Nov 2011 17:28:17 +0000 (-0800)
Subject: freezer: fix wait_event_freezable/__thaw_task races
X-Git-Tag: v3.3-rc1~148^2~24^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24b7ead3fb0bae267c2ee50898eb4c13aedd1e9f;p=pandora-kernel.git

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>
---

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