We are going to remove the first subflow socket soon, so avoid
the additional indirection via at listen() time. Instead call
directly the recently introduced helper on the first subflow sock.

No functional changes intended.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
v1 -> v2:
 - dropped msk backlog init chunk (Mat)
 - fixed commit message type (Mat)
---
 net/mptcp/protocol.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index fa62e6d2d1ac..4d9775f45dd6 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3762,6 +3762,7 @@ 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;
+	struct sock *ssk;
 	int err;
 
 	pr_debug("msk=%p", msk);
@@ -3778,15 +3779,19 @@ static int mptcp_listen(struct socket *sock, int backlog)
 		goto unlock;
 	}
 
+	ssk = msk->first;
 	inet_sk_state_store(sk, TCP_LISTEN);
 	sock_set_flag(sk, SOCK_RCU_FREE);
 
-	err = ssock->ops->listen(ssock, backlog);
-	inet_sk_state_store(sk, inet_sk_state_load(ssock->sk));
+	lock_sock(ssk);
+	err = __inet_listen_sk(ssk, backlog);
+	release_sock(ssk);
+	inet_sk_state_store(sk, inet_sk_state_load(ssk));
+
 	if (!err) {
 		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
-		mptcp_copy_inaddrs(sk, ssock->sk);
-		mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
+		mptcp_copy_inaddrs(sk, ssk);
+		mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CREATED);
 	}
 
 unlock:
-- 
2.41.0