[NET SCHED]: Adjust qlen when grafting in multiple qdiscs

net/sched/sch_cbq.c

@@ -1670,6 +1670,7 @@ static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 		sch_tree_lock(sch);
 		*old = cl->q;
 		cl->q = new;
+		sch->q.qlen -= (*old)->q.qlen;
 		qdisc_reset(*old);
 		sch_tree_unlock(sch);
 

net/sched/sch_dsmark.c

@@ -77,6 +77,7 @@ static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
 	*old = xchg(&p->q,new);
 	if (*old)
 		qdisc_reset(*old);
+	sch->q.qlen = 0;
 	sch_tree_unlock(sch); /* @@@ move up ? */
         return 0;
 }

net/sched/sch_prio.c

@@ -266,6 +266,7 @@ static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 	sch_tree_lock(sch);
 	*old = q->queues[band];
 	q->queues[band] = new;
+	sch->q.qlen -= (*old)->q.qlen;
 	qdisc_reset(*old);
 	sch_tree_unlock(sch);
 

net/sched/sch_tbf.c

@@ -455,6 +455,8 @@ static int tbf_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
 	sch_tree_lock(sch);	
 	*old = xchg(&q->qdisc, new);
 	qdisc_reset(*old);
+	sch->q.qlen = 0;
+	sch->stats.backlog = 0;
 	sch_tree_unlock(sch);
 	
 	return 0;