[TCP]: Move !in_sack test earlier in sacktag & reorganize if()s

All intermediate conditions include it already, make them
simpler as well.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index b39f0d8..901240f 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1406,28 +1406,25 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                        if (unlikely(in_sack < 0))
                                break;
 
+                       if (!in_sack) {
+                               fack_count += tcp_skb_pcount(skb);
+                               continue;
+                       }
+
                        sacked = TCP_SKB_CB(skb)->sacked;
 
                        /* Account D-SACK for retransmitted packet. */
-                       if ((dup_sack && in_sack) &&
-                           (sacked & TCPCB_RETRANS) &&
-                           after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
-                               tp->undo_retrans--;
-
-                       /* The frame is ACKed. */
-                       if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) {
-                               if (sacked&TCPCB_RETRANS) {
-                                       if ((dup_sack && in_sack) &&
-                                           (sacked&TCPCB_SACKED_ACKED))
-                                               reord = min(fack_count, reord);
-                               }
-
-                               /* Nothing to do; acked frame is about to be dropped. */
-                               fack_count += tcp_skb_pcount(skb);
-                               continue;
+                       if (dup_sack && (sacked & TCPCB_RETRANS)) {
+                               if (after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
+                                       tp->undo_retrans--;
+                               if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una) &&
+                                   (sacked & TCPCB_SACKED_ACKED))
+                                       reord = min(fack_count, reord);
                        }
 
-                       if (!in_sack) {
+
+                       /* Nothing to do; acked frame is about to be dropped (was ACKed). */
+                       if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) {
                                fack_count += tcp_skb_pcount(skb);
                                continue;
                        }