[TCP]: Do not call tcp_tso_acked() if no work to do.

In tcp_clean_rtx_queue(), if the TSO packet is not even partially
acked, do not waste time calling tcp_tso_acked().

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

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1dba7fd438da..b948e4eb39b7 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2038,7 +2038,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p, s32 *seq_usrtt
                  * the other end.
                  */
                 if (after(scb->end_seq, tp->snd_una)) {
-                        if (tcp_skb_pcount(skb) > 1)
+                        if (tcp_skb_pcount(skb) > 1 &&
+                            after(tp->snd_una, scb->seq))
                                 acked |= tcp_tso_acked(sk, skb,
                                                        now, &seq_rtt);
                         break;