tree f52002457cef52dd9e3cdcb490b6342a81767d9f
parent e0223003e6e141533446d01a92784592a97a8552
author Bart Van Assche <bart.vanassche@sandisk.com> 1475163210 -0700
committer Tejun Heo <tj@kernel.org> 1475224280 +0200

blkcg: Unlock blkcg_pol_mutex only once when cpd == NULL

Unlocking a mutex twice is wrong. Hence modify blkcg_policy_register()
such that blkcg_pol_mutex is unlocked once if cpd == NULL. This patch
avoids that smatch reports the following error:

block/blk-cgroup.c:1378: blkcg_policy_register() error: double unlock 'mutex:&blkcg_pol_mutex'

Fixes: 06b285bd1125 ("blkcg: fix blkcg_policy_data allocation bug")
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: <stable@vger.kernel.org> # v4.2+
Signed-off-by: Tejun Heo <tj@kernel.org>