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tipc: fix broken tipc_poll() function 

In commit ae236fb208 ("tipc: receive group membership events via
member socket") we broke the tipc_poll() function by checking the
state of the receive queue before the call to poll_sock_wait(), while
relying that state afterwards, when it might have changed.

We restore this in this commit.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2017-10-19 16:42:04 +02:00 committed by David S. Miller
parent 471abeabb4
commit cb4dc41eaa
1 changed files with 2 additions and 3 deletions
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5
net/tipc/socket.c
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@ -714,7 +714,6 @@ static unsigned int tipc_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_group *grp = tsk->group;
u32 revents = 0;
@ -733,7 +732,7 @@ static unsigned int tipc_poll(struct file *file, struct socket *sock,
/* fall thru' */
case TIPC_LISTEN:
case TIPC_CONNECTING:
if (skb)
if (!skb_queue_empty(&sk->sk_receive_queue))
revents |= POLLIN | POLLRDNORM;
break;
case TIPC_OPEN:
@ -742,7 +741,7 @@ static unsigned int tipc_poll(struct file *file, struct socket *sock,
revents |= POLLOUT;
if (!tipc_sk_type_connectionless(sk))
break;
if (!skb)
if (skb_queue_empty(&sk->sk_receive_queue))
break;
revents |= POLLIN | POLLRDNORM;
break;