[TCP]: Prior_fackets can be replaced by highest_sack seq

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

1 files changed, 2 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7a2bfd85fff0..5e01ac2c003c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1251,7 +1251,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
         struct sk_buff *cached_skb;
         int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3;
         int reord = tp->packets_out;
-        int prior_fackets;
         int flag = 0;
         int found_dup_sack = 0;
         int cached_fack_count;
@@ -1264,7 +1263,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                         tp->fackets_out = 0;
                 tp->highest_sack = tcp_write_queue_head(sk);
         }
-        prior_fackets = tp->fackets_out;
 
         found_dup_sack = tcp_check_dsack(tp, ack_skb, sp,
                                          num_sacks, prior_snd_una);
@@ -1457,7 +1455,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                                                 /* New sack for not retransmitted frame,
                                                  * which was in hole. It is reordering.
                                                  */
-                                                if (fack_count < prior_fackets)
+                                                if (before(TCP_SKB_CB(skb)->seq,
+                                                           tcp_highest_sack_seq(tp)))
                                                         reord = min(fack_count, reord);
 
                                                 /* SACK enhanced F-RTO (RFC4138; Appendix B) */