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af_iucv: block writing if msg limit is exceeded

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When polling on an AF_IUCV socket, writing should be blocked if the
number of pending messages exceeds a defined limit.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2012-02-08 00:19:46 +00:00 committed by David S. Miller
parent 7d316b9453
commit 7f1b0ea42a
1 changed files with 1 additions and 1 deletions
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2
net/iucv/af_iucv.c
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@ -1490,7 +1490,7 @@ unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
if (sk->sk_state == IUCV_DISCONN)
mask |= POLLIN;
if (sock_writeable(sk))
if (sock_writeable(sk) && iucv_below_msglim(sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
else
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);