[PATCH 4.4 091/312] sch_qfq: keep backlog updated with qlen

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: WANG Cong <xiyou.wangcong@xxxxxxxxx>

commit 2ed5c3f09627f72a2e0e407a86b2ac05494190f9 upstream.

Reported-by: Stas Nichiporovich <stasn77@xxxxxxxxx>
Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Cc: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Acked-by: Jamal Hadi Salim <jhs@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/sched/sch_qfq.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -1150,6 +1150,7 @@ static struct sk_buff *qfq_dequeue(struc
 	if (!skb)
 		return NULL;
 
+	qdisc_qstats_backlog_dec(sch, skb);
 	sch->q.qlen--;
 	qdisc_bstats_update(sch, skb);
 
@@ -1250,6 +1251,7 @@ static int qfq_enqueue(struct sk_buff *s
 	}
 
 	bstats_update(&cl->bstats, skb);
+	qdisc_qstats_backlog_inc(sch, skb);
 	++sch->q.qlen;
 
 	agg = cl->agg;
@@ -1516,6 +1518,7 @@ static void qfq_reset_qdisc(struct Qdisc
 			qdisc_reset(cl->qdisc);
 		}
 	}
+	sch->qstats.backlog = 0;
 	sch->q.qlen = 0;
 }