From: Tejun Heo <tj@kernel.org>
Date: Mon, 19 Nov 2012 16:13:37 +0000 (-0800)
Subject: cgroup: simplify cgroup_load_subsys() failure path
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~57^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d19e19de48aa0b90c56cd93c8a46ebac46273429;p=pandora-kernel.git

cgroup: simplify cgroup_load_subsys() failure path

Now that cgroup_unload_subsys() can tell whether the root css is
online or not, we can safely call cgroup_unload_subsys() after idr
init failure in cgroup_load_subsys().

Replace the manual unrolling and invoke cgroup_unload_subsys() on
failure.  This drops cgroup_mutex inbetween but should be safe as the
subsystem will fail try_module_get() and thus can't be mounted
inbetween.  As this means that cgroup_unload_subsys() can be called
before css_sets are rehashed, remove BUG_ON() on %NULL
css_set->subsys[] from cgroup_unload_subsys().

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