linux-kernel - [PATCH v4] workqueue: Remove unnecessary kfree(NULL)

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Date:   Wed, 27 May 2020 09:50:54 +0800
From:   <qiang.zhang@...driver.com>
To:     <tj@...nel.org>
CC:     <jiangshanlai@...il.com>, <markus.elfring@....de>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v4] workqueue: Remove unnecessary kfree(NULL)

From: Zhang Qiang <qiang.zhang@...driver.com>

The callback function "rcu_free_wq" could be called after memory
was released for "wq->rescuer" already and assignment is empty. so
remove unnecessary kfree(NULL).

Fixes: def98c84b6cd ("workqueue: Fix spurious sanity check failures in destroy_workqueue()")
Fixes: 8efe1223d73c ("workqueue: Fix missing kfree(rescuer) in destroy_workqueue()")

Signed-off-by: Zhang Qiang <qiang.zhang@...driver.com>
---
 v1->v2->v3->v4:
 Modify wrong submission information.

 kernel/workqueue.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 891ccad5f271..a2451cdcd503 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3491,7 +3491,6 @@ static void rcu_free_wq(struct rcu_head *rcu)
 	else
 		free_workqueue_attrs(wq->unbound_attrs);
 
-	kfree(wq->rescuer);
 	kfree(wq);
 }
 
-- 
2.24.1