Commit 5e50da01 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[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: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 43effa1e
......@@ -1687,7 +1687,7 @@ 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_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch_tree_unlock(sch);
......
......@@ -96,8 +96,8 @@ static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
sch_tree_lock(sch);
*old = xchg(&p->q, new);
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch->q.qlen = 0;
sch_tree_unlock(sch);
return 0;
......
......@@ -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;
......
......@@ -222,8 +222,10 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt)
for (i=q->bands; i<TCQ_PRIO_BANDS; i++) {
struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
if (child != &noop_qdisc)
if (child != &noop_qdisc) {
qdisc_tree_decrease_qlen(child, child->q.qlen);
qdisc_destroy(child);
}
}
sch_tree_unlock(sch);
......@@ -236,8 +238,11 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt)
sch_tree_lock(sch);
child = xchg(&q->queues[i], child);
if (child != &noop_qdisc)
if (child != &noop_qdisc) {
qdisc_tree_decrease_qlen(child,
child->q.qlen);
qdisc_destroy(child);
}
sch_tree_unlock(sch);
}
}
......@@ -295,7 +300,7 @@ 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_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch_tree_unlock(sch);
......
......@@ -229,8 +229,10 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
sch_tree_lock(sch);
q->flags = ctl->flags;
q->limit = ctl->limit;
if (child)
if (child) {
qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
qdisc_destroy(xchg(&q->qdisc, child));
}
red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
ctl->Plog, ctl->Scell_log,
......@@ -308,8 +310,8 @@ static int red_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;
}
......
......@@ -393,6 +393,7 @@ static int sfq_change(struct Qdisc *sch, struct rtattr *opt)
{
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 @@ static int sfq_change(struct Qdisc *sch, struct rtattr *opt)
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) {
......
......@@ -348,8 +348,10 @@ static int tbf_change(struct Qdisc* sch, struct rtattr *opt)
}
sch_tree_lock(sch);
if (child)
if (child) {
qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
qdisc_destroy(xchg(&q->qdisc, child));
}
q->limit = qopt->limit;
q->mtu = qopt->mtu;
q->max_size = max_size;
......@@ -451,8 +453,8 @@ static int tbf_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;
......
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