[PATCH] revert "cancel_delayed_work: use del_timer() instead of del_timer_sync()"

[Oleg Nesterov <oleg@tv-sign.ru>]

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>

--- t/include/linux/workqueue.h~	2007-05-17 22:55:59.000000000 +0400
+++ t/include/linux/workqueue.h	2007-05-17 23:03:03.000000000 +0400
@@ -160,7 +160,7 @@ static inline int cancel_delayed_work(st
 {
 	int ret;
 
-	ret = del_timer(&work->timer);
+	ret = del_timer_sync(&work->timer);
 	if (ret)
 		work_clear_pending(&work->work);
 	return ret;