tcp: update reordering first before detecting loss

tcp_mark_lost_retrans is not used when FACK is disabled. Since
tcp_update_reordering may disable FACK, it should be called first
before tcp_mark_lost_retrans.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7e6962bcfc30..bc790ea9960f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1820,14 +1820,12 @@ advance_sp:
         for (j = 0; j < used_sacks; j++)
                 tp->recv_sack_cache[i++] = sp[j];
 
-        tcp_mark_lost_retrans(sk);
-
-        tcp_verify_left_out(tp);
-
         if ((state.reord < tp->fackets_out) &&
             ((inet_csk(sk)->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker))
                 tcp_update_reordering(sk, tp->fackets_out - state.reord, 0);
 
+        tcp_mark_lost_retrans(sk);
+        tcp_verify_left_out(tp);
 out:
 
 #if FASTRETRANS_DEBUG > 0