1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d6d0f9b6cdc6..aaf6f66677f9 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2409,7 +2409,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
         int acked = 0;
         int prior_packets = tp->packets_out;
         __s32 seq_rtt = -1;
-        ktime_t last_ackt = ktime_set(0,0);
+        ktime_t last_ackt = net_invalid_timestamp();
 
         while ((skb = tcp_write_queue_head(sk)) &&
                skb != tcp_send_head(sk)) {
@@ -2487,6 +2487,10 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
                 tcp_ack_update_rtt(sk, acked, seq_rtt);
                 tcp_ack_packets_out(sk);
 
+                /* Is the ACK triggering packet unambiguous? */
+                if (acked & FLAG_RETRANS_DATA_ACKED)
+                        last_ackt = net_invalid_timestamp();
+
                 if (ca_ops->pkts_acked)
                         ca_ops->pkts_acked(sk, pkts_acked, last_ackt);
         }