1 files changed, 5 insertions, 2 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 163cf5fc0119..af354c98fdb5 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1640,8 +1640,11 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
                         goto send_now;
         }
 
-        /* Ok, it looks like it is advisable to defer.  */
-        tp->tso_deferred = 1 | (jiffies << 1);
+        /* Ok, it looks like it is advisable to defer.
+         * Do not rearm the timer if already set to not break TCP ACK clocking.
+         */
+        if (!tp->tso_deferred)
+                tp->tso_deferred = 1 | (jiffies << 1);
 
         return true;