From: David S. Miller <davem@davemloft.net>
Date: Wed, 16 Jul 2008 09:36:04 +0000 (-0700)
Subject: pkt_sched: Use per-queue locking in shutdown_scheduler_queue.
X-Git-Tag: v2.6.27-rc1~969^2~62
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17715e62a5e5c7224e5f906a4b8f9e5084100118;p=linux-2.6

pkt_sched: Use per-queue locking in shutdown_scheduler_queue.

This eliminates another qdisc_lock_tree user.

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

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 082db8abe7..efa418a1b3 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -757,18 +757,20 @@ static void shutdown_scheduler_queue(struct net_device *dev,
 	struct Qdisc *qdisc_default = _qdisc_default;
 
 	if (qdisc) {
+		spinlock_t *root_lock = qdisc_root_lock(qdisc);
+
 		dev_queue->qdisc = qdisc_default;
 		dev_queue->qdisc_sleeping = qdisc_default;
 
+		spin_lock(root_lock);
 		qdisc_destroy(qdisc);
+		spin_unlock(root_lock);
 	}
 }
 
 void dev_shutdown(struct net_device *dev)
 {
-	qdisc_lock_tree(dev);
 	netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
 	shutdown_scheduler_queue(dev, &dev->rx_queue, NULL);
 	BUG_TRAP(!timer_pending(&dev->watchdog_timer));
-	qdisc_unlock_tree(dev);
 }