From: Greg Thelen <gthelen@google.com>
Date: Wed, 28 Nov 2012 21:50:44 +0000 (-0800)
Subject: cgroup: fix lockdep warning for event_control
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~57^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=205a872bd6f9a9a09ef035ef1e90185a8245cc58;p=pandora-kernel.git

cgroup: fix lockdep warning for event_control

The cgroup_event_wake() function is called with the wait queue head
locked and it takes cgrp->event_list_lock. However, in cgroup_rmdir()
remove_wait_queue() was being called after taking
cgrp->event_list_lock.  Correct the lock ordering by using a temporary
list to obtain the event list to remove from the wait queue.

Signed-off-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Aaron Durbin <adurbin@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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