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-rw-r--r--net/tipc/socket.c61
1 files changed, 40 insertions, 21 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index b89c7b1a0d09..7b81fdd4f6d6 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -429,36 +429,55 @@ static int get_name(struct socket *sock, struct sockaddr *uaddr,
* to handle any preventable race conditions, so TIPC will do the same ...
*
* TIPC sets the returned events as follows:
- * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
- * or if a connection-oriented socket is does not have an active connection
- * (i.e. a read operation will not block).
- * b) POLLOUT is set except when a socket's connection has been terminated
- * (i.e. a write operation will not block).
- * c) POLLHUP is set when a socket's connection has been terminated.
- *
- * IMPORTANT: The fact that a read or write operation will not block does NOT
- * imply that the operation will succeed!
+ *
+ * socket state flags set
+ * ------------ ---------
+ * unconnected no read flags
+ * no write flags
+ *
+ * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
+ * no write flags
+ *
+ * connected POLLIN/POLLRDNORM if data in rx queue
+ * POLLOUT if port is not congested
+ *
+ * disconnecting POLLIN/POLLRDNORM/POLLHUP
+ * no write flags
+ *
+ * listening POLLIN if SYN in rx queue
+ * no write flags
+ *
+ * ready POLLIN/POLLRDNORM if data in rx queue
+ * [connectionless] POLLOUT (since port cannot be congested)
+ *
+ * IMPORTANT: The fact that a read or write operation is indicated does NOT
+ * imply that the operation will succeed, merely that it should be performed
+ * and will not block.
*/
static unsigned int poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
- u32 mask;
+ u32 mask = 0;
poll_wait(file, sk_sleep(sk), wait);
- if (!skb_queue_empty(&sk->sk_receive_queue) ||
- (sock->state == SS_UNCONNECTED) ||
- (sock->state == SS_DISCONNECTING))
- mask = (POLLRDNORM | POLLIN);
- else
- mask = 0;
-
- if (sock->state == SS_DISCONNECTING)
- mask |= POLLHUP;
- else
- mask |= POLLOUT;
+ switch ((int)sock->state) {
+ case SS_READY:
+ case SS_CONNECTED:
+ if (!tipc_sk_port(sk)->congested)
+ mask |= POLLOUT;
+ /* fall thru' */
+ case SS_CONNECTING:
+ case SS_LISTENING:
+ if (!skb_queue_empty(&sk->sk_receive_queue))
+ mask |= (POLLIN | POLLRDNORM);
+ break;
+ case SS_DISCONNECTING:
+ mask = (POLLIN | POLLRDNORM | POLLHUP);
+ break;
+ }
return mask;
}