revert "cancel_delayed_work: use del_timer() instead of del_timer_sync()"

As pointed out by Jarek Poplawski, the patch

	[WORKQUEUE]: cancel_delayed_work: use del_timer() instead of del_timer_sync()
	commit: 071b638689464c6b39407025eedd810d5b5e6f5d

was wrong, it was merged by mistake after that.

From the changelog:

	after this patch:
		...
		delayed_work_timer_fn->__queue_work() in progress.

		The latter doesn't differ from the caller's POV,

it does make a difference if the caller calls flush_workqueue() after
cancel_delayed_work(), in that case flush_workqueue() can miss this
work_struct.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Jarek Poplawski <jarkao2@o2.pl>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 7eae8665ff597b0f2ac7bf139a4184fb5825d9ef..ce0719a2cfeb03f7fc542f79cd70210ba838d15d 100644 (file)
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -160,7 +160,7 @@ static inline int cancel_delayed_work(struct delayed_work *work)
 {
        int ret;
 
-       ret = del_timer(&work->timer);
+       ret = del_timer_sync(&work->timer);
        if (ret)
                work_clear_pending(&work->work);
        return ret;