1 files changed, 12 insertions, 8 deletions

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index c5ea40c9eb2..13c4821e42b 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -82,6 +82,12 @@ struct netem_skb_cb {
         psched_time_t   time_to_send;
 };
 
+static inline struct netem_skb_cb *netem_skb_cb(struct sk_buff *skb)
+{
+        BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct netem_skb_cb));
+        return (struct netem_skb_cb *)skb->cb;
+}
+
 /* init_crandom - initialize correlated random number generator
  * Use entropy source for initial seed.
  */
@@ -184,7 +190,7 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
                 u32 dupsave = q->duplicate; /* prevent duplicating a dup... */
                 q->duplicate = 0;
 
-                rootq->enqueue(skb2, rootq);
+                qdisc_enqueue_root(skb2, rootq);
                 q->duplicate = dupsave;
         }
 
@@ -205,7 +211,7 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
                 skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8);
         }
 
-        cb = (struct netem_skb_cb *)skb->cb;
+        cb = netem_skb_cb(skb);
         if (q->gap == 0                 /* not doing reordering */
             || q->counter < q->gap      /* inside last reordering gap */
             || q->reorder < get_crandom(&q->reorder_cor)) {
@@ -218,7 +224,7 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
                 now = psched_get_time();
                 cb->time_to_send = now + delay;
                 ++q->counter;
-                ret = q->qdisc->enqueue(skb, q->qdisc);
+                ret = qdisc_enqueue(skb, q->qdisc);
         } else {
                 /*
                  * Do re-ordering by putting one out of N packets at the front
@@ -277,8 +283,7 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
 
         skb = q->qdisc->dequeue(q->qdisc);
         if (skb) {
-                const struct netem_skb_cb *cb
-                        = (const struct netem_skb_cb *)skb->cb;
+                const struct netem_skb_cb *cb = netem_skb_cb(skb);
                 psched_time_t now = psched_get_time();
 
                 /* if more time remaining? */
@@ -457,7 +462,7 @@ static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
 {
         struct fifo_sched_data *q = qdisc_priv(sch);
         struct sk_buff_head *list = &sch->q;
-        psched_time_t tnext = ((struct netem_skb_cb *)nskb->cb)->time_to_send;
+        psched_time_t tnext = netem_skb_cb(nskb)->time_to_send;
         struct sk_buff *skb;
 
         if (likely(skb_queue_len(list) < q->limit)) {
@@ -468,8 +473,7 @@ static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
                 }
 
                 skb_queue_reverse_walk(list, skb) {
-                        const struct netem_skb_cb *cb
-                                = (const struct netem_skb_cb *)skb->cb;
+                        const struct netem_skb_cb *cb = netem_skb_cb(skb);
 
                         if (tnext >= cb->time_to_send)
                                 break;