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| author | Eric Dumazet <edumazet@google.com> | 2014-03-08 17:01:19 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-10 20:44:21 +0100 |
| commit | 37314363cd65d19c71bea5f222e5108c93dc3c78 (patch) | |
| tree | f27b438ff9fccfae7fe7c85baf0763663f5b9569 /net/sched | |
| parent | Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/lin... (diff) | |
| download | linux-37314363cd65d19c71bea5f222e5108c93dc3c78.tar.xz linux-37314363cd65d19c71bea5f222e5108c93dc3c78.zip | |
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/sched')
| -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); |