[NET_SCHED]: Fix endless loops (part 2): "simple" qdiscs

Convert the "simple" qdiscs to use qdisc_tree_decrease_qlen() where
necessary:

- all graft operations
- destruction of old child qdiscs in prio, red and tbf change operation
- purging of queue in sfq change operation

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 90aeeb7b7167..672c35445793 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -662,8 +662,8 @@ static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 
         sch_tree_lock(sch);
         *old = xchg(&q->qdisc, new);
+        qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
         qdisc_reset(*old);
-        sch->q.qlen = 0;
         sch_tree_unlock(sch);
 
         return 0;