tcp: Add tcp_collapse_one to eliminate duplicated code

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e1b15d4e617162f3754e1aad1002eeff2057987e..580f9547ddfe24d589ae3b3714c60115c17dc35a 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4161,6 +4161,18 @@ add_sack:
        }
 }
 
+static struct sk_buff *tcp_collapse_one(struct sock *sk, struct sk_buff *skb,
+                                       struct sk_buff_head *list)
+{
+       struct sk_buff *next = skb->next;
+
+       __skb_unlink(skb, list);
+       __kfree_skb(skb);
+       NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRCVCOLLAPSED);
+
+       return next;
+}
+
 /* Collapse contiguous sequence of skbs head..tail with
  * sequence numbers start..end.
  * Segments with FIN/SYN are not collapsed (only because this
@@ -4178,11 +4190,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
        for (skb = head; skb != tail;) {
                /* No new bits? It is possible on ofo queue. */
                if (!before(start, TCP_SKB_CB(skb)->end_seq)) {
-                       struct sk_buff *next = skb->next;
-                       __skb_unlink(skb, list);
-                       __kfree_skb(skb);
-                       NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRCVCOLLAPSED);
-                       skb = next;
+                       skb = tcp_collapse_one(sk, skb, list);
                        continue;
                }
 
@@ -4246,11 +4254,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
                                start += size;
                        }
                        if (!before(start, TCP_SKB_CB(skb)->end_seq)) {
-                               struct sk_buff *next = skb->next;
-                               __skb_unlink(skb, list);
-                               __kfree_skb(skb);
-                               NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRCVCOLLAPSED);
-                               skb = next;
+                               skb = tcp_collapse_one(sk, skb, list);
                                if (skb == tail ||
                                    tcp_hdr(skb)->syn ||
                                    tcp_hdr(skb)->fin)