linux-kernel - [PATCH net-next 08/14] mptcp: avoid additional indirection in mptcp

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Message-Id: <20230811-upstream-net-next-20230811-mptcp-get-rid-of-msk-subflow-v1-8-36183269ade8@tessares.net>
Date:   Fri, 11 Aug 2023 17:57:21 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: [PATCH net-next 08/14] mptcp: avoid additional indirection in
 mptcp_poll()

From: Paolo Abeni <pabeni@...hat.com>

We are going to remove the first subflow socket soon, so avoid
the additional indirection at poll() time. Instead access
directly the first subflow sock.

No functional changes intended.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Reviewed-by: Mat Martineau <martineau@...nel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
 net/mptcp/protocol.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index d8b75fbc4f24..e89d1bf44f77 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3844,12 +3844,12 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
 	state = inet_sk_state_load(sk);
 	pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags);
 	if (state == TCP_LISTEN) {
-		struct socket *ssock = READ_ONCE(msk->subflow);
+		struct sock *ssk = READ_ONCE(msk->first);
 
-		if (WARN_ON_ONCE(!ssock || !ssock->sk))
+		if (WARN_ON_ONCE(!ssk))
 			return 0;
 
-		return inet_csk_listen_poll(ssock->sk);
+		return inet_csk_listen_poll(ssk);
 	}
 
 	shutdown = READ_ONCE(sk->sk_shutdown);

-- 
2.40.1