1 files changed, 6 insertions, 11 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0f0c1c9829a1..b9e429d2d1de 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3003,17 +3003,13 @@ static int tcp_process_frto(struct sock *sk, int flag)
         }
 
         if (tp->frto_counter == 1) {
-                /* Sending of the next skb must be allowed or no F-RTO */
-                if (!tcp_send_head(sk) ||
-                    after(TCP_SKB_CB(tcp_send_head(sk))->end_seq,
-                                     tp->snd_una + tp->snd_wnd)) {
-                        tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 2 : 3),
-                                            flag);
-                        return 1;
-                }
-
+                /* tcp_may_send_now needs to see updated state */
                 tp->snd_cwnd = tcp_packets_in_flight(tp) + 2;
                 tp->frto_counter = 2;
+
+                if (!tcp_may_send_now(sk))
+                        tcp_enter_frto_loss(sk, 2, flag);
+
                 return 1;
         } else {
                 switch (sysctl_tcp_frto_response) {
@@ -3069,6 +3065,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
         }
 
         prior_fackets = tp->fackets_out;
+        prior_in_flight = tcp_packets_in_flight(tp);
 
         if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
                 /* Window is constant, pure forward advance.
@@ -3108,8 +3105,6 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
         if (!prior_packets)
                 goto no_queue;
 
-        prior_in_flight = tcp_packets_in_flight(tp);
-
         /* See if we can take anything off of the retransmit queue. */
         flag |= tcp_clean_rtx_queue(sk, &seq_rtt, prior_fackets);