tcp: remove redundant argument from tcp_rcv_established()

The last (4th) argument of tcp_rcv_established() is redundant as it
always equals to skb->len and the skb itself is always passed as 2th
agrument. There is no reason to have it.

Signed-off-by: Ilya V. Matveychikov <matvejchikov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -362,7 +362,7 @@ void tcp_delack_timer_handler(struct sock *sk);
 int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
 void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
-			 const struct tcphdr *th, unsigned int len);
+			 const struct tcphdr *th);
 void tcp_rcv_space_adjust(struct sock *sk);
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
 void tcp_twsk_destructor(struct sock *sk);

net/ipv4/tcp_input.c

@@ -5358,8 +5358,9 @@ discard:
  *	tcp_data_queue when everything is OK.
  */
 void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
-			 const struct tcphdr *th, unsigned int len)
+			 const struct tcphdr *th)
 {
+	unsigned int len = skb->len;
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	tcp_mstamp_refresh(tp);

net/ipv4/tcp_ipv4.c

@@ -1458,7 +1458,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 				sk->sk_rx_dst = NULL;
 			}
 		}
-		tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
+		tcp_rcv_established(sk, skb, tcp_hdr(skb));
 		return 0;
 	}
 

net/ipv4/tcp_probe.c

@@ -105,8 +105,9 @@ static inline int tcp_probe_avail(void)
  * Note: arguments must match tcp_rcv_established()!
  */
 static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
-				 const struct tcphdr *th, unsigned int len)
+				 const struct tcphdr *th)
 {
+	unsigned int len = skb->len;
 	const struct tcp_sock *tp = tcp_sk(sk);
 	const struct inet_sock *inet = inet_sk(sk);
 
@@ -145,7 +146,7 @@ static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 				BUG();
 			}
 
-			p->length = skb->len;
+			p->length = len;
 			p->snd_nxt = tp->snd_nxt;
 			p->snd_una = tp->snd_una;
 			p->snd_cwnd = tp->snd_cwnd;

net/ipv6/tcp_ipv6.c

@@ -1296,7 +1296,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 			}
 		}
 
-		tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
+		tcp_rcv_established(sk, skb, tcp_hdr(skb));
 		if (opt_skb)
 			goto ipv6_pktoptions;
 		return 0;