4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Konstantin Khlebnikov <[email protected]> [ Upstream commit c90e95147c27b1780e76c6e8fea1b5c78d7d387f ] It was added in commit e57a784d8cae ("pkt_sched: set root qdisc before change() in attach_default_qdiscs()") to hide duplicates from "tc qdisc show" for incative deivices. After 59cc1f61f ("net: sched: convert qdisc linked list to hashtable") it triggered when classful qdisc is added to inactive device because default qdiscs are added before switching root qdisc. Anyway after commit ea3274695353 ("net: sched: avoid duplicates in qdisc dump") duplicates are filtered right in dumper. Signed-off-by: Konstantin Khlebnikov <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/sched/sch_api.c | 3 --- 1 file changed, 3 deletions(-) --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -277,9 +277,6 @@ static struct Qdisc *qdisc_match_from_ro void qdisc_hash_add(struct Qdisc *q) { if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { - struct Qdisc *root = qdisc_dev(q)->qdisc; - - WARN_ON_ONCE(root == &noop_qdisc); ASSERT_RTNL(); hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); }
