firewire: net: invalidate ARP entries of removed nodes

This makes it possible to resume communication with a node that dropped
off the bus for a brief period.  Otherwise communication will only be
possible after ARP cache entry timeouts.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (rebased)

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index c2e194c..7ed08fd 100644 (file)
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -191,6 +191,7 @@ struct fwnet_peer {
        struct fwnet_device *dev;
        u64 guid;
        u64 fifo;
+       __be32 ip;
 
        /* guarded by dev->lock */
        struct list_head pd_list; /* received partial datagrams */
@@ -570,6 +571,8 @@ static int fwnet_finish_incoming_packet(struct net_device *net,
                                peer->speed = sspd;
                        if (peer->max_payload > max_payload)
                                peer->max_payload = max_payload;
+
+                       peer->ip = arp1394->sip;
                }
                spin_unlock_irqrestore(&dev->lock, flags);
 
@@ -1470,6 +1473,7 @@ static int fwnet_add_peer(struct fwnet_device *dev,
        peer->dev = dev;
        peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
        peer->fifo = FWNET_NO_FIFO_ADDR;
+       peer->ip = 0;
        INIT_LIST_HEAD(&peer->pd_list);
        peer->pdg_size = 0;
        peer->datagram_label = 0;
@@ -1589,10 +1593,13 @@ static int fwnet_remove(struct device *_dev)
 
        mutex_lock(&fwnet_device_mutex);
 
+       net = dev->netdev;
+       if (net && peer->ip)
+               arp_invalidate(net, peer->ip);
+
        fwnet_remove_peer(peer, dev);
 
        if (list_empty(&dev->peer_list)) {
-               net = dev->netdev;
                unregister_netdev(net);
 
                if (dev->local_fifo != FWNET_NO_FIFO_ADDR)