[PATCH] net_sched/hhf: update hierarchical backlog when drop packet

[Konstantin Khlebnikov]

When hhf_enqueue() drops packet from another bucket it
have to update backlog at upper qdiscs too.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
---
 net/sched/sch_hhf.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c
index 51d3ba682af9..c8d84436e427 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -406,8 +406,11 @@ static int hhf_enqueue(struct sk_buff *skb, struct Qdisc 
*sch,
        /* Return Congestion Notification only if we dropped a packet from this
         * bucket.
         */
-       if (hhf_drop(sch, to_free) == idx)
+       if (hhf_drop(sch, to_free) == idx) {
+               qdisc_tree_reduce_backlog(sch, 0,
+                                         prev_backlog - sch->qstats.backlog);
                return NET_XMIT_CN;
+       }
 
        /* As we dropped a packet, better let upper stack know this. */
        qdisc_tree_reduce_backlog(sch, 1, prev_backlog - sch->qstats.backlog);