From e57a784d8cae429f5b697fe55abf420181d9ff09 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 12 Dec 2013 15:41:56 -0800 Subject: pkt_sched: set root qdisc before change() in attach_default_qdiscs() After commit 95dc19299f74 ("pkt_sched: give visibility to mq slave qdiscs") we call disc_list_add() while the device qdisc might be the noop_qdisc one. This shows up as duplicates in "tc qdisc show", as all inactive devices point to noop_qdisc. Fix this by setting dev->qdisc to the new qdisc before calling ops->change() in attach_default_qdiscs() Add a WARN_ON_ONCE() to catch any future similar problem. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/sched/sch_generic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/sched/sch_generic.c') diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 6a91d7d48ad..32bb942d2fa 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -718,8 +718,8 @@ static void attach_default_qdiscs(struct net_device *dev) } else { qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT); if (qdisc) { - qdisc->ops->attach(qdisc); dev->qdisc = qdisc; + qdisc->ops->attach(qdisc); } } } -- cgit v1.2.3-70-g09d2