A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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Revert "net: simplify sock_poll_wait"

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This reverts commit dd979b4df8.

This broke tcp_poll for SMC fallback: An AF_SMC socket establishes an
internal TCP socket for the initial handshake with the remote peer.
Whenever the SMC connection can not be established this TCP socket is
used as a fallback. All socket operations on the SMC socket are then
forwarded to the TCP socket. In case of poll, the file->private_data
pointer references the SMC socket because the TCP socket has no file
assigned. This causes tcp_poll to wait on the wrong socket.

Signed-off-by: Karsten Graul <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Karsten Graul 2018-10-23 13:40:39 +02:00 • committed by David S. Miller
commit 89ab066d42
13 changed files with 22 additions and 16 deletions
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2
net/nfc/llcp_sock.c
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@ -556,7 +556,7 @@ static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
pr_debug("%p\n", sk);
sock_poll_wait(file, wait);
sock_poll_wait(file, sock, wait);
if (sk->sk_state == LLCP_LISTEN)
return llcp_accept_poll(sk);