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-rw-r--r--net/sched/sch_generic.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 48be3d5..a74e278 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -30,6 +30,10 @@
#include <net/pkt_sched.h>
#include <net/dst.h>
+/* Qdisc to use by default */
+const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops;
+EXPORT_SYMBOL(default_qdisc_ops);
+
/* Main transmission queue. */
/* Modifications to data participating in scheduling must be protected with
@@ -530,12 +534,11 @@ struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.dump = pfifo_fast_dump,
.owner = THIS_MODULE,
};
-EXPORT_SYMBOL(pfifo_fast_ops);
static struct lock_class_key qdisc_tx_busylock;
struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
- struct Qdisc_ops *ops)
+ const struct Qdisc_ops *ops)
{
void *p;
struct Qdisc *sch;
@@ -579,10 +582,14 @@ errout:
}
struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
- struct Qdisc_ops *ops, unsigned int parentid)
+ const struct Qdisc_ops *ops,
+ unsigned int parentid)
{
struct Qdisc *sch;
+ if (!try_module_get(ops->owner))
+ goto errout;
+
sch = qdisc_alloc(dev_queue, ops);
if (IS_ERR(sch))
goto errout;
@@ -686,7 +693,7 @@ static void attach_one_default_qdisc(struct net_device *dev,
if (dev->tx_queue_len) {
qdisc = qdisc_create_dflt(dev_queue,
- &pfifo_fast_ops, TC_H_ROOT);
+ default_qdisc_ops, TC_H_ROOT);
if (!qdisc) {
netdev_info(dev, "activation failed\n");
return;
@@ -739,9 +746,8 @@ void dev_activate(struct net_device *dev)
int need_watchdog;
/* No queueing discipline is attached to device;
- create default one i.e. pfifo_fast for devices,
- which need queueing and noqueue_qdisc for
- virtual interfaces
+ * create default one for devices, which need queueing
+ * and noqueue_qdisc for virtual interfaces
*/
if (dev->qdisc == &noop_qdisc)
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