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tipc: return early for non-blocking sockets at link congestion

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Until now, in stream/mcast send() we pass the message to the link
layer even when the link is congested and add the socket to the
link's wakeup queue. This is unnecessary for non-blocking sockets.
If a socket is set to non-blocking and sends multicast with zero
back off time while receiving EAGAIN, we exhaust the memory.

In this commit, we return immediately at stream/mcast send() for
non-blocking sockets.

Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parthasarathy Bhuvaragan 2016-11-01 14:02:34 +01:00 committed by David S. Miller
parent 169650d3ea
commit 7cf87fa278
1 changed files with 6 additions and 0 deletions
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6
net/tipc/socket.c
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@ -697,6 +697,9 @@ static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
uint mtu;
int rc;
if (!timeo && tsk->link_cong)
return -ELINKCONG;
msg_set_type(mhdr, TIPC_MCAST_MSG);
msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
msg_set_destport(mhdr, 0);
@ -1072,6 +1075,9 @@ static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
}
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
if (!timeo && tsk->link_cong)
return -ELINKCONG;
dnode = tsk_peer_node(tsk);
skb_queue_head_init(&pktchain);