1 files changed, 17 insertions, 18 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 84bcdc94dfa9..20c9440ab85e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1444,12 +1444,17 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                                                 tp->retransmit_skb_hint = NULL;
                                         }
                                 } else {
-                                        /* New sack for not retransmitted frame,
-                                         * which was in hole. It is reordering.
-                                         */
-                                        if (!(sacked & TCPCB_RETRANS) &&
-                                            fack_count < prior_fackets)
-                                                reord = min(fack_count, reord);
+                                        if (!(sacked & TCPCB_RETRANS)) {
+                                                /* New sack for not retransmitted frame,
+                                                 * which was in hole. It is reordering.
+                                                 */
+                                                if (fack_count < prior_fackets)
+                                                        reord = min(fack_count, reord);
+
+                                                /* SACK enhanced F-RTO (RFC4138; Appendix B) */
+                                                if (!after(TCP_SKB_CB(skb)->end_seq, tp->frto_highmark))
+                                                        flag |= FLAG_ONLY_ORIG_SACKED;
+                                        }
 
                                         if (sacked & TCPCB_LOST) {
                                                 TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST;
@@ -1458,18 +1463,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                                                 /* clear lost hint */
                                                 tp->retransmit_skb_hint = NULL;
                                         }
-                                        /* SACK enhanced F-RTO detection.
-                                         * Set flag if and only if non-rexmitted
-                                         * segments below frto_highmark are
-                                         * SACKed (RFC4138; Appendix B).
-                                         * Clearing correct due to in-order walk
-                                         */
-                                        if (after(end_seq, tp->frto_highmark)) {
-                                                flag &= ~FLAG_ONLY_ORIG_SACKED;
-                                        } else {
-                                                if (!(sacked & TCPCB_RETRANS))
-                                                        flag |= FLAG_ONLY_ORIG_SACKED;
-                                        }
                                 }
 
                                 TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED;
@@ -1503,6 +1496,12 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                                 tp->retransmit_skb_hint = NULL;
                         }
                 }
+
+                /* SACK enhanced FRTO (RFC4138, Appendix B): Clearing correct
+                 * due to in-order walk
+                 */
+                if (after(end_seq, tp->frto_highmark))
+                        flag &= ~FLAG_ONLY_ORIG_SACKED;
         }
 
         if (tp->retrans_out &&