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Diffstat (limited to 'net/sched/sch_skbprio.c')
-rw-r--r--net/sched/sch_skbprio.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/sched/sch_skbprio.c b/net/sched/sch_skbprio.c
index b4dd626c30..20ff7386b7 100644
--- a/net/sched/sch_skbprio.c
+++ b/net/sched/sch_skbprio.c
@@ -79,7 +79,9 @@ static int skbprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
prio = min(skb->priority, max_priority);
qdisc = &q->qdiscs[prio];
- if (sch->q.qlen < sch->limit) {
+
+ /* sch->limit can change under us from skbprio_change() */
+ if (sch->q.qlen < READ_ONCE(sch->limit)) {
__skb_queue_tail(qdisc, skb);
qdisc_qstats_backlog_inc(sch, skb);
q->qstats[prio].backlog += qdisc_pkt_len(skb);
@@ -172,7 +174,7 @@ static int skbprio_change(struct Qdisc *sch, struct nlattr *opt,
if (opt->nla_len != nla_attr_size(sizeof(*ctl)))
return -EINVAL;
- sch->limit = ctl->limit;
+ WRITE_ONCE(sch->limit, ctl->limit);
return 0;
}
@@ -200,7 +202,7 @@ static int skbprio_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct tc_skbprio_qopt opt;
- opt.limit = sch->limit;
+ opt.limit = READ_ONCE(sch->limit);
if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
return -1;