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firewire: net: fix unicast reception RCODE in failure paths 

The incoming request hander fwnet_receive_packet() expects subsequent
datagram handling code to return non-zero on errors.  However, almost
none of the failure paths did so.  Fix them all.

(This error reporting is used to send and RCODE_CONFLICT_ERROR to the
sender node in such failure cases.  Two modes of failure exist:  Out of
memory, or firewire-net is unaware of any peer node to which a fragment
or an ARP packet belongs.  However, it is unclear whether a sender can
actually make use of such information.  A Linux peer apparently can't.
Maybe it should all be simplified to void functions.)

Reported-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2010-08-16 23:45:54 +02:00
parent a481e97d3c
commit 1bf145fed5
1 changed files with 15 additions and 13 deletions
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28
drivers/firewire/net.c
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@ -579,7 +579,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net,
if (!peer) {
fw_notify("No peer for ARP packet from %016llx\n",
(unsigned long long)peer_guid);
goto failed_proto;
goto no_peer;
}
/*
@ -656,7 +656,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net,
return 0;
failed_proto:
no_peer:
net->stats.rx_errors++;
net->stats.rx_dropped++;
@ -664,7 +664,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net,
if (netif_queue_stopped(net))
netif_wake_queue(net);
return 0;
return -ENOENT;
}
static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
@ -701,7 +701,7 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
fw_error("out of memory\n");
net->stats.rx_dropped++;
return -1;
return -ENOMEM;
}
skb_reserve(skb, (net->hard_header_len + 15) & ~15);
memcpy(skb_put(skb, len), buf, len);
@ -726,8 +726,10 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
spin_lock_irqsave(&dev->lock, flags);
peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
if (!peer)
goto bad_proto;
if (!peer) {
retval = -ENOENT;
goto fail;
}
pd = fwnet_pd_find(peer, datagram_label);
if (pd == NULL) {
@ -741,7 +743,7 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
dg_size, buf, fg_off, len);
if (pd == NULL) {
retval = -ENOMEM;
goto bad_proto;
goto fail;
}
peer->pdg_size++;
} else {
@ -755,9 +757,9 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
pd = fwnet_pd_new(net, peer, datagram_label,
dg_size, buf, fg_off, len);
if (pd == NULL) {
retval = -ENOMEM;
peer->pdg_size--;
goto bad_proto;
retval = -ENOMEM;
goto fail;
}
} else {
if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
@ -768,7 +770,8 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
*/
fwnet_pd_delete(pd);
peer->pdg_size--;
goto bad_proto;
retval = -ENOMEM;
goto fail;
}
}
} /* new datagram or add to existing one */
@ -794,14 +797,13 @@ static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
bad_proto:
fail:
spin_unlock_irqrestore(&dev->lock, flags);
if (netif_queue_stopped(net))
netif_wake_queue(net);
return 0;
return retval;
}
static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,