From: Tejun Heo <tj@kernel.org>
Date: Tue, 13 May 2014 16:19:23 +0000 (-0400)
Subject: cgroup: nest kernfs active protection under cgroup_mutex
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~81^2~29
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01f6474ce04fffd6282b569ac0a31f4b98d4c82a;p=pandora-kernel.git

cgroup: nest kernfs active protection under cgroup_mutex

After the recent cgroup_kn_lock_live() changes, cgroup_mutex is no
longer nested below kernfs active protection.  The two don't have any
relationship now.

This patch nests kernfs active protection under cgroup_mutex.  All
cftype operations now require both cgroup_tree_mutex and cgroup_mutex,
temporary cgroup_mutex releases over kernfs operations are removed,
and cgroup_add/rm_cftypes() grab both mutexes.

This makes cgroup_tree_mutex redundant, which will be removed by the
next patch.

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

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