[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>
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index d0d6e59..459cda2 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -393,6 +393,7 @@
{
struct sfq_sched_data *q = qdisc_priv(sch);
struct tc_sfq_qopt *ctl = RTA_DATA(opt);
+ unsigned int qlen;
if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
return -EINVAL;
@@ -403,8 +404,10 @@
if (ctl->limit)
q->limit = min_t(u32, ctl->limit, SFQ_DEPTH);
+ qlen = sch->q.qlen;
while (sch->q.qlen >= q->limit-1)
sfq_drop(sch);
+ qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen);
del_timer(&q->perturb_timer);
if (q->perturb_period) {