Merge remote-tracking branch 'lsk/v3.10/topic/gator' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / net / ipv4 / tcp_output.c

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 4a4e8746d1b2841b9306955453e2dbe7bbe5daaf..56e29f0e230e4a6c06a24d7a5ee08856a644f697 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2428,13 +2428,15 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
                if (!tp->retrans_stamp)
                        tp->retrans_stamp = TCP_SKB_CB(skb)->when;
 
-               tp->undo_retrans += tcp_skb_pcount(skb);
-
                /* snd_nxt is stored to detect loss of retransmitted segment,
                 * see tcp_input.c tcp_sacktag_write_queue().
                 */
                TCP_SKB_CB(skb)->ack_seq = tp->snd_nxt;
        }
+
+       if (tp->undo_retrans < 0)
+               tp->undo_retrans = 0;
+       tp->undo_retrans += tcp_skb_pcount(skb);
        return err;
 }