1 files changed, 6 insertions, 0 deletions

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 8bd30976cdee..6db77d1329f7 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -621,7 +621,13 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds,
         /* The receiver of the HEARTBEAT ACK should also perform an
          * RTT measurement for that destination transport address
          * using the time value carried in the HEARTBEAT ACK chunk.
+         * If the transport's rto_pending variable has been cleared,
+         * it was most likely due to a retransmit.  However, we want
+         * to re-enable it to properly update the rto.
          */
+        if (t->rto_pending == 0)
+                t->rto_pending = 1;
+
         hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
         sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at));