commit 3df066c835cdb6dd5ee093292e1c41ae584fafa3
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date:   Mon Jun 18 11:59:47 2018 -0700

    net_sched: remove a bogus warning in hfsc
    
    Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 3ae9877ea205..3278a76f6861 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1385,8 +1385,8 @@ hfsc_schedule_watchdog(struct Qdisc *sch)
 		if (next_time == 0 || next_time > q->root.cl_cfmin)
 			next_time = q->root.cl_cfmin;
 	}
-	WARN_ON(next_time == 0);
-	qdisc_watchdog_schedule(&q->watchdog, next_time);
+	if (next_time)
+		qdisc_watchdog_schedule(&q->watchdog, next_time);
 }
 
 static int