net: Remove __skb_insert() calls outside of skbuff internals.

This minor cleanup simplifies later changes which will convert
struct sk_buff and friends over to using struct list_head.

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/cassini.c

@@ -2182,7 +2182,7 @@ static inline void cas_rx_flow_pkt(struct cas *cp, const u64 *words,
 	 * do any additional locking here. stick the buffer
 	 * at the end.
 	 */
-	__skb_insert(skb, flow->prev, (struct sk_buff *) flow, flow);
+	__skb_queue_tail(flow, skb);
 	if (words[0] & RX_COMP1_RELEASE_FLOW) {
 		while ((skb = __skb_dequeue(flow))) {
 			cas_skb_release(skb);

drivers/net/ppp_generic.c

@@ -1864,7 +1864,7 @@ ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb)
 	for (p = list->next; p != (struct sk_buff *)list; p = p->next)
 		if (seq_before(seq, p->sequence))
 			break;
-	__skb_insert(skb, p->prev, p, list);
+	__skb_queue_before(list, p, skb);
 }
 
 /*

drivers/net/pppol2tp.c

@@ -353,7 +353,7 @@ static void pppol2tp_recv_queue_skb(struct pppol2tp_session *session, struct sk_
 	spin_lock_bh(&session->reorder_q.lock);
 	skb_queue_walk_safe(&session->reorder_q, skbp, tmp) {
 		if (PPPOL2TP_SKB_CB(skbp)->ns > ns) {
-			__skb_insert(skb, skbp->prev, skbp, &session->reorder_q);
+			__skb_queue_before(&session->reorder_q, skbp, skb);
 			PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
 			       "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n",
 			       session->name, ns, PPPOL2TP_SKB_CB(skbp)->ns,

include/net/tcp.h

@@ -1268,12 +1268,12 @@ static inline void tcp_insert_write_queue_after(struct sk_buff *skb,
 	__skb_queue_after(&sk->sk_write_queue, skb, buff);
 }
 
-/* Insert skb between prev and next on the write queue of sk.  */
+/* Insert new before skb on the write queue of sk.  */
 static inline void tcp_insert_write_queue_before(struct sk_buff *new,
 						  struct sk_buff *skb,
 						  struct sock *sk)
 {
-	__skb_insert(new, skb->prev, skb, &sk->sk_write_queue);
+	__skb_queue_before(&sk->sk_write_queue, skb, new);
 
 	if (sk->sk_send_head == skb)
 		sk->sk_send_head = new;

net/ipv4/tcp_input.c

@@ -4156,7 +4156,7 @@ drop:
 				skb1 = skb1->prev;
 			}
 		}
-		__skb_insert(skb, skb1, skb1->next, &tp->out_of_order_queue);
+		__skb_queue_after(&tp->out_of_order_queue, skb1, skb);
 
 		/* And clean segments covered by new one as whole. */
 		while ((skb1 = skb->next) !=
@@ -4254,7 +4254,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
 		memcpy(nskb->head, skb->head, header);
 		memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
 		TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(nskb)->end_seq = start;
-		__skb_insert(nskb, skb->prev, skb, list);
+		__skb_queue_before(list, skb, nskb);
 		skb_set_owner_r(nskb, sk);
 
 		/* Copy data, releasing collapsed skbs. */

net/sctp/ulpqueue.c

@@ -317,7 +317,7 @@ static void sctp_ulpq_store_reasm(struct sctp_ulpq *ulpq,
 	}
 
 	/* Insert before pos. */
-	__skb_insert(sctp_event2skb(event), pos->prev, pos, &ulpq->reasm);
+	__skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event));
 
 }
 
@@ -825,8 +825,7 @@ static void sctp_ulpq_store_ordered(struct sctp_ulpq *ulpq,
 
 
 	/* Insert before pos. */
-	__skb_insert(sctp_event2skb(event), pos->prev, pos, &ulpq->lobby);
+	__skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
-
 }
 
 static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *ulpq,