ipv4: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in some cases I placed the "fall through" comment
on its own line, which is what GCC is expecting to find.

Addresses-Coverity-ID: 115108
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d0682ce2a5d6..b2390bfdc68f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2885,6 +2885,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const int acked,
                       (*ack_flag & FLAG_LOST_RETRANS)))
                         return;
                 /* Change state if cwnd is undone or retransmits are lost */
+                /* fall through */
         default:
                 if (tcp_is_reno(tp)) {
                         if (flag & FLAG_SND_UNA_ADVANCED)
@@ -6044,6 +6045,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
         case TCP_LAST_ACK:
                 if (!before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt))
                         break;
+                /* fall through */
         case TCP_FIN_WAIT1:
         case TCP_FIN_WAIT2:
                 /* RFC 793 says to queue data in these states,