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firewire: net: set carrier state at ifup

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At ifup, carrier status would be shown on even if it actually was off.
Also add an include for ethtool_ops rather than to rely on the one from
netdevice.h.

Note, we can alas not use fwnet_device_mutex to serialize access to
dev->peer_count (as I originally wanted).  This would cause a lock
inversion:
  - fwnet_probe | takes fwnet_device_mutex
      + register_netdev | takes rtnl_mutex
  - devinet_ioctl | takes rtnl_mutex
      + fwnet_open | ...must not take fwnet_device_mutex

Hence use the dev->lock spinlock for serialization.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2010-12-17 22:22:33 +01:00
parent 18bb36f9fa
commit c16714704b
1 changed files with 21 additions and 15 deletions
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36
drivers/firewire/net.c
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@ -9,6 +9,7 @@
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/highmem.h>
@ -178,8 +179,8 @@ struct fwnet_device {
/* Number of tx datagrams that have been queued but not yet acked */
int queued_datagrams;
int peer_count;
int peer_count;
struct list_head peer_list;
struct fw_card *card;
struct net_device *netdev;
@ -1222,6 +1223,14 @@ static int fwnet_broadcast_start(struct fwnet_device *dev)
return retval;
}
static void set_carrier_state(struct fwnet_device *dev)
{
if (dev->peer_count > 1)
netif_carrier_on(dev->netdev);
else
netif_carrier_off(dev->netdev);
}
/* ifup */
static int fwnet_open(struct net_device *net)
{
@ -1235,6 +1244,10 @@ static int fwnet_open(struct net_device *net)
}
netif_start_queue(net);
spin_lock_irq(&dev->lock);
set_carrier_state(dev);
spin_unlock_irq(&dev->lock);
return 0;
}
@ -1429,7 +1442,6 @@ static void fwnet_init_dev(struct net_device *net)
net->type = ARPHRD_IEEE1394;
net->tx_queue_len = FWNET_TX_QUEUE_LEN;
net->ethtool_ops = &fwnet_ethtool_ops;
}
/* caller must hold fwnet_device_mutex */
@ -1471,6 +1483,7 @@ static int fwnet_add_peer(struct fwnet_device *dev,
spin_lock_irq(&dev->lock);
list_add_tail(&peer->peer_link, &dev->peer_list);
dev->peer_count++;
set_carrier_state(dev);
spin_unlock_irq(&dev->lock);
return 0;
@ -1542,9 +1555,6 @@ static int fwnet_probe(struct device *_dev)
unregister_netdev(net);
list_del(&dev->dev_link);
}
if (dev->peer_count > 1)
netif_carrier_on(net);
out:
if (ret && allocated_netdev)
free_netdev(net);
@ -1554,14 +1564,15 @@ static int fwnet_probe(struct device *_dev)
return ret;
}
static void fwnet_remove_peer(struct fwnet_peer *peer)
static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev)
{
struct fwnet_partial_datagram *pd, *pd_next;
spin_lock_irq(&peer->dev->lock);
spin_lock_irq(&dev->lock);
list_del(&peer->peer_link);
peer->dev->peer_count--;
spin_unlock_irq(&peer->dev->lock);
dev->peer_count--;
set_carrier_state(dev);
spin_unlock_irq(&dev->lock);
list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link)
fwnet_pd_delete(pd);
@ -1578,12 +1589,7 @@ static int fwnet_remove(struct device *_dev)
mutex_lock(&fwnet_device_mutex);
fwnet_remove_peer(peer);
/* If we serve just one node, that means we lost link
with outer world */
if (dev->peer_count == 1)
netif_carrier_off(dev->netdev);
fwnet_remove_peer(peer, dev);
if (list_empty(&dev->peer_list)) {
net = dev->netdev;