linux-kernel - [PATCH V3] workqueue: fix double unlock bug

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Message-ID: <1798086.IHnGGWGxmu@daeseok-laptop.cloud.net>
Date:	Tue, 15 Apr 2014 08:17:43 +0900
From:	Daeseok Youn <daeseok.youn@...il.com>
To:	tj@...nel.org, laijs@...fujitsu.com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH V3] workqueue: fix double unlock bug


Use default pwq 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@...il.com>
---
V2: replace "if condition" with "goto" as Lai's comment.
V3: Use default pwq when alloc_unbound_pwq() is failed.

 kernel/workqueue.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0ee63af..0679854 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 +4097,8 @@ 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;
+		mutex_lock(&wq->mutex);
+		goto use_dfl_pwq;
 	}
 
 	/*
-- 
1.7.4.4


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