linux-kernel - [PATCH v2] kernel/kthread.c: kthread_worker: add work status check in timer

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Message-ID: <20200925050759.20805-1-qiang.zhang@windriver.com>
Date:   Fri, 25 Sep 2020 13:07:59 +0800
From:   <qiang.zhang@...driver.com>
To:     <tj@...nel.org>, <pmladek@...e.com>
CC:     <akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] kernel/kthread.c: kthread_worker: add work status check in timer_fn

From: Zqiang <qiang.zhang@...driver.com>

When queue delayed work to worker, at some point after that the timer_fn
will be call, add work to worker's work_list, at this time, the work may
be cancel, so add "work->canceling" check current work status.

Signed-off-by: Zqiang <qiang.zhang@...driver.com>
---
 v1->v2:
 Change description information.

 kernel/kthread.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 3edaa380dc7b..85a2c9b32049 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -897,7 +897,8 @@ void kthread_delayed_work_timer_fn(struct timer_list *t)
 	/* Move the work from worker->delayed_work_list. */
 	WARN_ON_ONCE(list_empty(&work->node));
 	list_del_init(&work->node);
-	kthread_insert_work(worker, work, &worker->work_list);
+	if (!work->canceling)
+		kthread_insert_work(worker, work, &worker->work_list);
 
 	raw_spin_unlock_irqrestore(&worker->lock, flags);
 }
-- 
2.17.1