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

Signed-off-by: Oleg Nesterov <>
Cc: Jarek Poplawski <>
Cc: David Howells <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
1 file changed