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-rw-r--r--net/sched/sch_generic.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 5173c1e..aeddabf 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -24,6 +24,7 @@
#include <linux/init.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
+#include <linux/slab.h>
#include <net/pkt_sched.h>
/* Main transmission queue. */
@@ -528,7 +529,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
unsigned int size;
int err = -ENOBUFS;
- /* ensure that the Qdisc and the private data are 32-byte aligned */
+ /* ensure that the Qdisc and the private data are 64-byte aligned */
size = QDISC_ALIGN(sizeof(*sch));
size += ops->priv_size + (QDISC_ALIGNTO - 1);
@@ -590,6 +591,13 @@ void qdisc_reset(struct Qdisc *qdisc)
}
EXPORT_SYMBOL(qdisc_reset);
+static void qdisc_rcu_free(struct rcu_head *head)
+{
+ struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
+
+ kfree((char *) qdisc - qdisc->padded);
+}
+
void qdisc_destroy(struct Qdisc *qdisc)
{
const struct Qdisc_ops *ops = qdisc->ops;
@@ -613,7 +621,11 @@ void qdisc_destroy(struct Qdisc *qdisc)
dev_put(qdisc_dev(qdisc));
kfree_skb(qdisc->gso_skb);
- kfree((char *) qdisc - qdisc->padded);
+ /*
+ * gen_estimator est_timer() might access qdisc->q.lock,
+ * wait a RCU grace period before freeing qdisc.
+ */
+ call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
}
EXPORT_SYMBOL(qdisc_destroy);
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