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kthread_worker: prevent queuing delayed work from timer_fn when it is being canceled

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commit 6993d0fdbee0eb38bfac350aa016f65ad11ed3b1 upstream.

There is a small race window when a delayed work is being canceled and
the work still might be queued from the timer_fn:

	CPU0						CPU1
kthread_cancel_delayed_work_sync()
   __kthread_cancel_work_sync()
     __kthread_cancel_work()
        work->canceling++;
					      kthread_delayed_work_timer_fn()
						   kthread_insert_work();

BUG: kthread_insert_work() should not get called when work->canceling is
set.

Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201014083030.16895-1-qiang.zhang@windriver.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zqiang
2020-11-01 17:07:53 -08:00
committed by Greg Kroah-Hartman
parent 1471e96263
commit 68e8b8ed78
1 changed files with 2 additions and 1 deletions
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1
kernel/kthread.c
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@@ -863,6 +863,7 @@ void kthread_delayed_work_timer_fn(struct timer_list *t)
/* Move the work from worker->delayed_work_list. */ /* Move the work from worker->delayed_work_list. */
WARN_ON_ONCE(list_empty(&work->node)); WARN_ON_ONCE(list_empty(&work->node));
list_del_init(&work->node); list_del_init(&work->node);
if (!work->canceling)
kthread_insert_work(worker, work, &worker->work_list); kthread_insert_work(worker, work, &worker->work_list);
spin_unlock(&worker->lock); spin_unlock(&worker->lock);