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atm/br2684: register notifier event for carrier signal changes. 

When a signal change event occurs call netif_carrier_on/off.

Signed-off-by: Karl Hiramoto <karl@hiramoto.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karl Hiramoto 2010-07-08 20:55:31 +00:00 committed by David S. Miller
parent 7313bb8f3d
commit 005066122b
1 changed files with 64 additions and 2 deletions
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66
net/atm/br2684.c
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@ -139,6 +139,43 @@ static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
return NULL;
}
static int atm_dev_event(struct notifier_block *this, unsigned long event,
void *arg)
{
struct atm_dev *atm_dev = arg;
struct list_head *lh;
struct net_device *net_dev;
struct br2684_vcc *brvcc;
struct atm_vcc *atm_vcc;
unsigned long flags;
pr_debug("event=%ld dev=%p\n", event, atm_dev);
read_lock_irqsave(&devs_lock, flags);
list_for_each(lh, &br2684_devs) {
net_dev = list_entry_brdev(lh);
list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
atm_vcc = brvcc->atmvcc;
if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
netif_carrier_off(net_dev);
else
netif_carrier_on(net_dev);
}
}
}
read_unlock_irqrestore(&devs_lock, flags);
return NOTIFY_DONE;
}
static struct notifier_block atm_dev_notifier = {
.notifier_call = atm_dev_event,
};
/* chained vcc->pop function. Check if we should wake the netif_queue */
static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
@ -362,6 +399,12 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
unregister_netdev(net_dev);
free_netdev(net_dev);
}
read_lock_irq(&devs_lock);
if (list_empty(&br2684_devs)) {
/* last br2684 device */
unregister_atmdevice_notifier(&atm_dev_notifier);
}
read_unlock_irq(&devs_lock);
return;
}
@ -530,6 +573,13 @@ static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
br2684_push(atmvcc, skb);
}
/* initialize netdev carrier state */
if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
netif_carrier_off(net_dev);
else
netif_carrier_on(net_dev);
__module_get(THIS_MODULE);
return 0;
@ -620,9 +670,16 @@ static int br2684_create(void __user *arg)
}
write_lock_irq(&devs_lock);
brdev->payload = payload;
brdev->number = list_empty(&br2684_devs) ? 1 :
BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
if (list_empty(&br2684_devs)) {
/* 1st br2684 device */
register_atmdevice_notifier(&atm_dev_notifier);
brdev->number = 1;
} else
brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
list_add_tail(&brdev->br2684_devs, &br2684_devs);
write_unlock_irq(&devs_lock);
return 0;
@ -772,6 +829,11 @@ static void __exit br2684_exit(void)
remove_proc_entry("br2684", atm_proc_root);
#endif
/* if not already empty */
if (!list_empty(&br2684_devs))
unregister_atmdevice_notifier(&atm_dev_notifier);
while (!list_empty(&br2684_devs)) {
net_dev = list_entry_brdev(br2684_devs.next);
brdev = BRPRIV(net_dev);