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tipc: fix inconsistent signal handling regression 

Commit 9bbb4ecc68 ("tipc: standardize recvmsg routine") changed
the sleep/wakeup behaviour for sockets entering recv() or accept().
In this process the order of reporting -EAGAIN/-EINTR was reversed.
This caused problems with wrong errno being reported back if the
timeout expires. The same problem happens if the socket is
nonblocking and recv()/accept() is called when the process have
pending signals. If there is no pending data read or connections to
accept, -EINTR will be returned instead of -EAGAIN.

Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Reported-by László Benedek <laszlo.benedek@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Erik Hugne 2015-03-09 10:43:42 +01:00 committed by David S. Miller
parent 57ad7a0a81
commit 143fe22f50
1 changed files with 6 additions and 6 deletions
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12
net/tipc/socket.c
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@ -1318,12 +1318,12 @@ static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
err = 0;
if (!skb_queue_empty(&sk->sk_receive_queue))
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!timeo)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
}
finish_wait(sk_sleep(sk), &wait);
*timeop = timeo;
@ -2026,12 +2026,12 @@ static int tipc_wait_for_accept(struct socket *sock, long timeo)
err = -EINVAL;
if (sock->state != SS_LISTENING)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
err = -EAGAIN;
if (!timeo)
break;
err = sock_intr_errno(timeo);
if (signal_pending(current))
break;
}
finish_wait(sk_sleep(sk), &wait);
return err;