From: Jarek Poplawski <jarkao2@gmail.com>
Date: Wed, 27 Aug 2008 09:22:07 +0000 (-0700)
Subject: pkt_sched: Use rcu_assign_pointer() to change dev_queue->qdisc
X-Git-Tag: v2.6.27-rc5~8^2~9
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7a54c13c7b072d9426bd5cec1cdb8306df5ef55;p=linux-2.6

pkt_sched: Use rcu_assign_pointer() to change dev_queue->qdisc

These pointers are RCU protected, so proper primitives should be used.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 341d558b6e..ad9cda1b8c 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -635,7 +635,7 @@ static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 	if (qdisc == NULL)
 		qdisc = &noop_qdisc;
 	dev_queue->qdisc_sleeping = qdisc;
-	dev_queue->qdisc = &noop_qdisc;
+	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
 
 	spin_unlock_bh(root_lock);
 
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 5f0ade7806..9634091ee2 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -634,7 +634,7 @@ static void dev_deactivate_queue(struct net_device *dev,
 		if (!(qdisc->flags & TCQ_F_BUILTIN))
 			set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state);
 
-		dev_queue->qdisc = qdisc_default;
+		rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
 		qdisc_reset(qdisc);
 
 		spin_unlock_bh(qdisc_lock(qdisc));
@@ -709,7 +709,7 @@ static void shutdown_scheduler_queue(struct net_device *dev,
 	struct Qdisc *qdisc_default = _qdisc_default;
 
 	if (qdisc) {
-		dev_queue->qdisc = qdisc_default;
+		rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
 		dev_queue->qdisc_sleeping = qdisc_default;
 
 		qdisc_destroy(qdisc);