1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c
index e0e9d1383c7c..ba7c63ca5bb1 100644
--- a/net/ipv4/tcp_highspeed.c
+++ b/net/ipv4/tcp_highspeed.c
@@ -135,10 +135,11 @@ static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt,
 
                 /* Do additive increase */
                 if (tp->snd_cwnd < tp->snd_cwnd_clamp) {
-                        tp->snd_cwnd_cnt += ca->ai;
+                        /* cwnd = cwnd + a(w) / cwnd */
+                        tp->snd_cwnd_cnt += ca->ai + 1;
                         if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
-                                tp->snd_cwnd++;
                                 tp->snd_cwnd_cnt -= tp->snd_cwnd;
+                                tp->snd_cwnd++;
                         }
                 }
         }