mptcp: avoid subflow socket usage in mptcp_get_port()

We are going to remove the first subflow socket soon, so avoid
accessing it in mptcp_get_port(). Instead, access directly the
first subflow sock.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index b888d63..891f497 100644 (file)
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3405,14 +3405,12 @@ static void mptcp_unhash(struct sock *sk)
 static int mptcp_get_port(struct sock *sk, unsigned short snum)
 {
        struct mptcp_sock *msk = mptcp_sk(sk);
-       struct socket *ssock;
 
-       ssock = msk->subflow;
-       pr_debug("msk=%p, subflow=%p", msk, ssock);
-       if (WARN_ON_ONCE(!ssock))
+       pr_debug("msk=%p, ssk=%p", msk, msk->first);
+       if (WARN_ON_ONCE(!msk->first))
                return -EINVAL;
 
-       return inet_csk_get_port(ssock->sk, snum);
+       return inet_csk_get_port(msk->first, snum);
 }
 
 void mptcp_finish_connect(struct sock *ssk)