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tipc: fix hanging clients using poll with EPOLLOUT flag

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commit 517d7c79bd ("tipc: fix hanging poll() for stream sockets")
introduced a regression for clients using non-blocking sockets.
After the commit, we send EPOLLOUT event to the client even in
TIPC_CONNECTING state. This causes the subsequent send() to fail
with ENOTCONN, as the socket is still not in TIPC_ESTABLISHED state.

In this commit, we:
- improve the fix for hanging poll() by replacing sk_data_ready()
  with sk_state_change() to wake up all clients.
- revert the faulty updates introduced by commit 517d7c79bd
  ("tipc: fix hanging poll() for stream sockets").

Fixes: 517d7c79bd ("tipc: fix hanging poll() for stream sockets")
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parthasarathy Bhuvaragan 2019-05-09 07:13:42 +02:00 committed by David S. Miller
parent 9871a9e47a
commit ff946833b7
1 changed files with 2 additions and 2 deletions
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4
net/tipc/socket.c
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@ -736,11 +736,11 @@ static __poll_t tipc_poll(struct file *file, struct socket *sock,
switch (sk->sk_state) {
case TIPC_ESTABLISHED:
case TIPC_CONNECTING:
if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
revents |= EPOLLOUT;
/* fall through */
case TIPC_LISTEN:
case TIPC_CONNECTING:
if (!skb_queue_empty(&sk->sk_receive_queue))
revents |= EPOLLIN | EPOLLRDNORM;
break;
@ -2043,7 +2043,7 @@ static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
if (msg_data_sz(hdr))
return true;
/* Empty ACK-, - wake up sleeping connect() and drop */
sk->sk_data_ready(sk);
sk->sk_state_change(sk);
msg_set_dest_droppable(hdr, 1);
return false;
}