From: Daeseok Youn <daeseok.youn@gmail.com>
Date: Wed, 16 Apr 2014 05:32:29 +0000 (+0900)
Subject: workqueue: fix bugs in wq_update_unbound_numa() failure path
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~189^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77f300b198f93328c26191b52655ce1b62e202cf;p=pandora-kernel.git

workqueue: fix bugs in wq_update_unbound_numa() failure path

wq_update_unbound_numa() failure path has the following two bugs.

- alloc_unbound_pwq() is called without holding wq->mutex; however, if
  the allocation fails, it jumps to out_unlock which tries to unlock
  wq->mutex.

- The function should switch to dfl_pwq on failure but didn't do so
  after alloc_unbound_pwq() failure.

Fix it by regrabbing wq->mutex and jumping to use_dfl_pwq on
alloc_unbound_pwq() failure.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Acked-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 4c16bd327c74 ("workqueue: implement NUMA affinity for unbound workqueues")
---

Reading git-diff-tree failed