tcp: get rid of tcp_check_send_head()

This helper is used only once, and its name is no longer relevant.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -1716,12 +1716,6 @@ static inline bool tcp_rtx_and_write_queues_empty(const struct sock *sk)
 	return tcp_rtx_queue_empty(sk) && tcp_write_queue_empty(sk);
 }
 
-static inline void tcp_check_send_head(struct sock *sk, struct sk_buff *skb_unlinked)
-{
-	if (tcp_write_queue_empty(sk))
-		tcp_chrono_stop(sk, TCP_CHRONO_BUSY);
-}
-
 static inline void __tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb)
 {
 	__skb_queue_tail(&sk->sk_write_queue, skb);

net/ipv4/tcp.c

@@ -1412,7 +1412,8 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 		/* It is the one place in all of TCP, except connection
 		 * reset, where we can be unlinking the send_head.
 		 */
-		tcp_check_send_head(sk, skb);
+		if (tcp_write_queue_empty(sk))
+			tcp_chrono_stop(sk, TCP_CHRONO_BUSY);
 		sk_wmem_free_skb(sk, skb);
 	}