diff options
| author | Eric Dumazet <[email protected]> | 2014-03-08 08:01:19 -0800 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2014-03-10 15:44:21 -0400 |
| commit | 37314363cd65d19c71bea5f222e5108c93dc3c78 (patch) | |
| tree | f27b438ff9fccfae7fe7c85baf0763663f5b9569 | |
| parent | 92f092d16c5ff6e71d8e7761e4c9193375d3c994 (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 <[email protected]>
Tested-by: Mirco Tischler <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
| -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 1313145e3b86..a07d55e75698 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -273,11 +273,12 @@ static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) 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); + } } EXPORT_SYMBOL(qdisc_list_add); |