[NET_SCHED] make ingress qlock symmetric to egress

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>

--- a/net/sched/sch_generic.c	2007/09/10 23:19:45	1.1
+++ b/net/sched/sch_generic.c	2007/09/10 23:52:45
@@ -42,12 +42,12 @@
 void qdisc_lock_tree(struct net_device *dev)
 {
 	spin_lock_bh(&dev->queue_lock);
-	spin_lock(&dev->ingress_lock);
+	spin_lock_bh(&dev->ingress_lock);
 }
 
 void qdisc_unlock_tree(struct net_device *dev)
 {
-	spin_unlock(&dev->ingress_lock);
+	spin_unlock_bh(&dev->ingress_lock);
 	spin_unlock_bh(&dev->queue_lock);
 }