From: Menglong Dong <imagedong@tencent.com>

'sock->sk' is used frequently in mptcp_listen(). Therefore, we can
introduce the 'sk' and replace 'sock->sk' with it.

Signed-off-by: Menglong Dong <imagedong@tencent.com>
---
 net/mptcp/protocol.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index a4fd971a7aa4..f9bcc724d9e2 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3655,12 +3655,13 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 static int mptcp_listen(struct socket *sock, int backlog)
 {
 	struct mptcp_sock *msk = mptcp_sk(sock->sk);
+	struct sock *sk = sock->sk;
 	struct socket *ssock;
 	int err;
 
 	pr_debug("msk=%p", msk);
 
-	lock_sock(sock->sk);
+	lock_sock(sk);
 	ssock = __mptcp_nmpc_socket(msk);
 	if (!ssock) {
 		err = -EINVAL;
@@ -3668,16 +3669,16 @@ static int mptcp_listen(struct socket *sock, int backlog)
 	}
 
 	mptcp_token_destroy(msk);
-	inet_sk_state_store(sock->sk, TCP_LISTEN);
-	sock_set_flag(sock->sk, SOCK_RCU_FREE);
+	inet_sk_state_store(sk, TCP_LISTEN);
+	sock_set_flag(sk, SOCK_RCU_FREE);
 
 	err = ssock->ops->listen(ssock, backlog);
-	inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk));
+	inet_sk_state_store(sk, inet_sk_state_load(ssock->sk));
 	if (!err)
-		mptcp_copy_inaddrs(sock->sk, ssock->sk);
+		mptcp_copy_inaddrs(sk, ssock->sk);
 
 unlock:
-	release_sock(sock->sk);
+	release_sock(sk);
 	return err;
 }
 
-- 
2.37.2