pkt_sched: Grab correct lock in notify_and_destroy().

From: Jarek Poplawski <jarkao2@gmail.com>

When we are destroying non-root qdiscs, we need to lock
the root of the qdisc tree not the the qdisc itself.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index c25465e5607a..c8dc72e12107 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -638,9 +638,9 @@ static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid
                 qdisc_notify(skb, n, clid, old, new);
 
         if (old) {
-                spin_lock_bh(&old->q.lock);
+                sch_tree_lock(old);
                 qdisc_destroy(old);
-                spin_unlock_bh(&old->q.lock);
+                sch_tree_unlock(old);
         }
 }