From: Tejun Heo <tj@kernel.org>
Date: Tue, 13 May 2014 15:28:30 +0000 (-0400)
Subject: cgroup: fix rcu_read_lock() leak in update_if_frozen()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~169^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=36e9d2ebcc15d029b33f42a36146ab5a5bcfcfe7;p=pandora-kernel.git

cgroup: fix rcu_read_lock() leak in update_if_frozen()

While updating cgroup_freezer locking, 68fafb77d827 ("cgroup_freezer:
replace freezer->lock with freezer_mutex") introduced a bug in
update_if_frozen() where it returns with rcu_read_lock() held.  Fix it
by adding rcu_read_unlock() before returning.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
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