From: Li Zefan <lizefan@huawei.com>
Date: Tue, 18 Jun 2013 10:41:10 +0000 (+0800)
Subject: cgroup: fix umount vs cgroup_event_remove() race
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~44^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c8158eeae0f37d0eee9f1fbe68080df6a408df2;p=pandora-kernel.git

cgroup: fix umount vs cgroup_event_remove() race

 commit 5db9a4d99b0157a513944e9a44d29c9cec2e91dc
 Author: Tejun Heo <tj@kernel.org>
 Date:   Sat Jul 7 16:08:18 2012 -0700

     cgroup: fix cgroup hierarchy umount race

This commit fixed a race caused by the dput() in css_dput_fn(), but
the dput() in cgroup_event_remove() can also lead to the same BUG().

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
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