[PATCH V2] workqueue: fix double unlock bug

[Daeseok Youn <daeseok.youn@gmail.com>]

mutex_unlock() and put_pwq_unlocked() do not need to be called
when alloc_unbound_pwq() is failed.

And remove "if" condition for whether "pwq" is same as "wq->dfl_pwq"
when wq_calc_node_cpumask() returns false and just use "goto use_dfl_pwq"

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
---
V2: replace "if condition" with "goto" as Lai's comment.

 kernel/workqueue.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0ee63af..9853067 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4087,10 +4087,7 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
 		if (cpumask_equal(cpumask, pwq->pool->attrs->cpumask))
 			goto out_unlock;
 	} else {
-		if (pwq == wq->dfl_pwq)
-			goto out_unlock;
-		else
-			goto use_dfl_pwq;
+		goto use_dfl_pwq;
 	}
 
 	mutex_unlock(&wq->mutex);
@@ -4100,7 +4097,7 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
 	if (!pwq) {
 		pr_warning("workqueue: allocation failed while updating NUMA affinity of \"%s\"\n",
 			   wq->name);
-		goto out_unlock;
+		return;
 	}
 
 	/*
-- 
1.7.4.4