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mptcp: avoid unneeded __mptcp_nmpc_socket() usage

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In a few spots, the mptcp code invokes the __mptcp_nmpc_socket() helper
multiple times under the same socket lock scope. Additionally, in such
places, the socket status ensures that there is no MP capable handshake
running.

Under the above condition we can replace the later __mptcp_nmpc_socket()
helper invocation with direct access to the msk->subflow pointer and
better document such access is not supposed to fail with WARN().

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2023-04-14 16:08:01 +02:00 committed by David S. Miller
parent 7a486c443c
commit 6176123169
1 changed files with 6 additions and 3 deletions
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9
net/mptcp/protocol.c
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@ -3143,7 +3143,7 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
struct socket *listener;
struct sock *newsk;
listener = __mptcp_nmpc_socket(msk);
listener = msk->subflow;
if (WARN_ON_ONCE(!listener)) {
*err = -EINVAL;
return NULL;
@ -3363,7 +3363,7 @@ static int mptcp_get_port(struct sock *sk, unsigned short snum)
struct mptcp_sock *msk = mptcp_sk(sk);
struct socket *ssock;
ssock = __mptcp_nmpc_socket(msk);
ssock = msk->subflow;
pr_debug("msk=%p, subflow=%p", msk, ssock);
if (WARN_ON_ONCE(!ssock))
return -EINVAL;
@ -3709,7 +3709,10 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
pr_debug("msk=%p", msk);
ssock = __mptcp_nmpc_socket(msk);
/* buggy applications can call accept on socket states other then LISTEN
* but no need to allocate the first subflow just to error out.
*/
ssock = msk->subflow;
if (!ssock)
return -EINVAL;