From: Tejun Heo <tj@kernel.org>
Date: Mon, 19 Nov 2012 16:13:37 +0000 (-0800)
Subject: cgroup: fix harmless bugs in cgroup_load_subsys() fail path and cgroup_unload_subsys()
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~57^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02ae7486d05ae6df8395409a4945b2420f1e35c2;p=pandora-kernel.git

cgroup: fix harmless bugs in cgroup_load_subsys() fail path and cgroup_unload_subsys()

* If idr init fails, cgroup_load_subsys() cleared dummytop->subsys[]
  before calilng ->destroy() making CSS inaccessible to the callback,
  and didn't unlink ss->sibling.  As no modular controller uses
  ->use_id, this doesn't cause any actual problems.

* cgroup_unload_subsys() was forgetting to free idr, call
  ->pre_destroy() and clear ->active.  As there currently is no
  modular controller which uses ->use_id, ->pre_destroy() or ->active,
  this doesn't cause any actual problems.

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