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authorEric Dumazet <edumazet@google.com>2014-03-08 08:01:19 -0800
committerDavid S. Miller <davem@davemloft.net>2014-03-10 15:44:21 -0400
commit37314363cd65d19c71bea5f222e5108c93dc3c78 (patch)
treef27b438ff9fccfae7fe7c85baf0763663f5b9569 /net
parent92f092d16c5ff6e71d8e7761e4c9193375d3c994 (diff)
downloadlinux-linaro-stable-37314363cd65d19c71bea5f222e5108c93dc3c78.tar.gz
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.c7
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);