12 files changed, 37 insertions, 21 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 8a44386b35cf..f396dff335a3 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -306,6 +306,16 @@ static inline bool qdisc_tx_is_noop(const struct net_device *dev)
         return true;
 }
 
+static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+{
+        return sch->enqueue(skb, sch);
+}
+
+static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
+{
+        return qdisc_enqueue(skb, sch);
+}
+
 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
                                        struct sk_buff_head *list)
 {
diff --git a/net/core/dev.c b/net/core/dev.c
index 065b9817e209..2eed17bcb2dd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1781,7 +1781,7 @@ gso:
 
                 spin_lock(root_lock);
 
-                rc = q->enqueue(skb, q);
+                rc = qdisc_enqueue_root(skb, q);
                 qdisc_run(q);
 
                 spin_unlock(root_lock);
@@ -2083,7 +2083,7 @@ static int ing_filter(struct sk_buff *skb)
         q = rxq->qdisc;
         if (q) {
                 spin_lock(qdisc_lock(q));
-                result = q->enqueue(skb, q);
+                result = qdisc_enqueue_root(skb, q);
                 spin_unlock(qdisc_lock(q));
         }
 
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index 6e8099e77043..07edda0b8a5c 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -289,7 +289,7 @@ void ieee80211_requeue(struct ieee80211_local *local, int queue)
                 root_lock = qdisc_root_lock(qdisc);
 
                 spin_lock(root_lock);
-                qdisc->enqueue(skb, qdisc);
+                qdisc_enqueue_root(skb, qdisc);
                 spin_unlock(root_lock);
         }
 
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 0de757e3be4a..68ed35e2a763 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -429,7 +429,7 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 #endif
         }
 
-        ret = flow->q->enqueue(skb, flow->q);
+        ret = qdisc_enqueue(skb, flow->q);
         if (ret != 0) {
 drop: __maybe_unused
                 sch->qstats.drops++;
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index a3953bbe2d79..1afe3eece627 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -387,7 +387,8 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 #ifdef CONFIG_NET_CLS_ACT
         cl->q->__parent = sch;
 #endif
-        if ((ret = cl->q->enqueue(skb, cl->q)) == NET_XMIT_SUCCESS) {
+        ret = qdisc_enqueue(skb, cl->q);
+        if (ret == NET_XMIT_SUCCESS) {
                 sch->q.qlen++;
                 sch->bstats.packets++;
                 sch->bstats.bytes+=len;
@@ -671,7 +672,7 @@ static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child)
                 q->rx_class = cl;
                 cl->q->__parent = sch;
 
-                if (cl->q->enqueue(skb, cl->q) == 0) {
+                if (qdisc_enqueue(skb, cl->q) == 0) {
                         sch->q.qlen++;
                         sch->bstats.packets++;
                         sch->bstats.bytes+=len;
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 3aafbd17393a..44d347e831cf 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -252,7 +252,7 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
                 }
         }
 
-        err = p->q->enqueue(skb, p->q);
+        err = qdisc_enqueue(skb, p->q);
         if (err != NET_XMIT_SUCCESS) {
                 sch->qstats.drops++;
                 return err;
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 5090708ba384..fd61ed6ee1e7 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1586,7 +1586,7 @@ hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
         }
 
         len = skb->len;
-        err = cl->qdisc->enqueue(skb, cl->qdisc);
+        err = qdisc_enqueue(skb, cl->qdisc);
         if (unlikely(err != NET_XMIT_SUCCESS)) {
                 cl->qstats.drops++;
                 sch->qstats.drops++;
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index ee48457eaa4a..72b5a946178f 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -572,8 +572,7 @@ static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
                 kfree_skb(skb);
                 return ret;
 #endif
-        } else if (cl->un.leaf.q->enqueue(skb, cl->un.leaf.q) !=
-                   NET_XMIT_SUCCESS) {
+        } else if (qdisc_enqueue(skb, cl->un.leaf.q) != NET_XMIT_SUCCESS) {
                 sch->qstats.drops++;
                 cl->qstats.drops++;
                 return NET_XMIT_DROP;
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index c5ea40c9eb21..13c4821e42b8 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;
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 536ca474dc69..d29c2f87fc0b 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -81,7 +81,8 @@ prio_enqueue(struct sk_buff *skb, struct Qdisc *sch)
         }
 #endif
 
-        if ((ret = qdisc->enqueue(skb, qdisc)) == NET_XMIT_SUCCESS) {
+        ret = qdisc_enqueue(skb, qdisc);
+        if (ret == NET_XMIT_SUCCESS) {
                 sch->bstats.bytes += skb->len;
                 sch->bstats.packets++;
                 sch->q.qlen++;
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 77098acf0adc..b48a391bc129 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -92,7 +92,7 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
                         break;
         }
 
-        ret = child->enqueue(skb, child);
+        ret = qdisc_enqueue(skb, child);
         if (likely(ret == NET_XMIT_SUCCESS)) {
                 sch->bstats.bytes += skb->len;
                 sch->bstats.packets++;
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 444c227fcb6b..7d705b86dae5 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -133,7 +133,8 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc* sch)
                 return NET_XMIT_DROP;
         }
 
-        if ((ret = q->qdisc->enqueue(skb, q->qdisc)) != 0) {
+        ret = qdisc_enqueue(skb, q->qdisc);
+        if (ret != 0) {
                 sch->qstats.drops++;
                 return ret;
         }