diff options
| author | Eric Dumazet <edumazet@google.com> | 2014-03-08 08:01:19 -0800 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-18 12:47:02 +0200 |
| commit | d5aa8a74f0a044cf7a64f99f9b9351ebe92be475 (patch) | |
| tree | 47dab14e55d9619021018ecbce5a5579201e84c4 /net | |
| parent | bac350f120e381299df33d5832352013c5ae8b5e (diff) | |
pkt_sched: move the sanity test in qdisc_list_add()
The WARN_ON(root == &noop_qdisc)) added in qdisc_list_add()
can trigger in normal conditions when devices are not up.
It should be done only right before the list_add_tail() call.
Fixes: e57a784d8cae4 ("pkt_sched: set root qdisc before change() in attach_default_qdiscs()")
Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Tested-by: Mirco Tischler <mt-ml@gmx.de>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_api.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 4df817499..066211a84 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -221,11 +221,12 @@ static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) static void qdisc_list_add(struct Qdisc *q) { - struct Qdisc *root = qdisc_dev(q)->qdisc; + if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { + struct Qdisc *root = qdisc_dev(q)->qdisc; - WARN_ON_ONCE(root == &noop_qdisc); - if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) + WARN_ON_ONCE(root == &noop_qdisc); list_add_tail(&q->list, &root->list); + } } void qdisc_list_del(struct Qdisc *q) |