diff --git a/[refs] b/[refs]
index 496fb4f6ada4..997a9157e77a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1e757f9996114f713a79d3fbcd08739efcfc5c34
+refs/heads/master: b8ed601cefe7a4014b93560bd846caf44f25b1c1
diff --git a/trunk/net/ipv4/tcp_input.c b/trunk/net/ipv4/tcp_input.c
index 41163ddc312c..378ca8a086a3 100644
--- a/trunk/net/ipv4/tcp_input.c
+++ b/trunk/net/ipv4/tcp_input.c
@@ -2112,7 +2112,10 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una,
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
-	int is_dupack = (tp->snd_una == prior_snd_una && !(flag&FLAG_NOT_DUP));
+	int is_dupack = (tp->snd_una == prior_snd_una &&
+			 (!(flag&FLAG_NOT_DUP) ||
+			  ((flag&FLAG_DATA_SACKED) &&
+			   (tp->fackets_out > tp->reordering))));
 
 	/* Some technical things:
 	 * 1. Reno does not count dupacks (sacked_out) automatically. */