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 341d558..ad9cda1 100644 (file)
--- 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 5f0ade7..9634091 100644 (file)
--- 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);