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net: Return errno in sk->sk_prot->get_port().
We assume the correct errno is -EADDRINUSE when sk->sk_prot->get_port() fails, so some ->get_port() functions return just 1 on failure and the callers return -EADDRINUSE instead. However, mptcp_get_port() can return -EINVAL. Let's not ignore the error. Note the only exception is inet_autobind(), all of whose callers return -EAGAIN instead. Fixes: cec37a6 ("mptcp: Handle MP_CAPABLE options for outgoing connections") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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