diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ccefe574dcf7f93b99cc3bb8b415096111a37395..47cdd7e76f2bc3a47d8b9dba8ba8154b96e91163 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -647,7 +647,7 @@ EXPORT_SYMBOL(schedule_delayed_work);
  */
 void flush_delayed_work(struct delayed_work *dwork)
 {
-	if (del_timer(&dwork->timer)) {
+	if (del_timer_sync(&dwork->timer)) {
 		struct cpu_workqueue_struct *cwq;
 		cwq = wq_per_cpu(keventd_wq, get_cpu());
 		__queue_work(cwq, &dwork->work);