Commit 7313bb8f authored by Karl Hiramoto's avatar Karl Hiramoto Committed by David S. Miller
Browse files

atm: propagate signal changes via notifier 



Add notifier chain for changes in atm_dev.

Clients like br2684 will call register_atmdevice_notifier() to be notified of
changes. Drivers will call atm_dev_signal_change() to notify clients like
br2684 of the change.

On DSL and ATM devices it's usefull to have a know if you have a carrier
signal. netdevice LOWER_UP changes can be propagated to userspace via netlink
monitor.

Signed-off-by: default avatarKarl Hiramoto <karl@hiramoto.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 68dc9d36

include/linux/atmdev.h

+17 −0
Original line number Diff line number Diff line
@@ -431,6 +431,14 @@ struct atm_dev *atm_dev_register(const char *type,const struct atmdev_ops *ops, 
    int number,unsigned long *flags); /* number == -1: pick first available */

struct atm_dev *atm_dev_lookup(int number);

void atm_dev_deregister(struct atm_dev *dev);



/* atm_dev_signal_change

 *

 * Propagate lower layer signal change in atm_dev->signal to netdevice.

 * The event will be sent via a notifier call chain.

 */

void atm_dev_signal_change(struct atm_dev *dev, char signal);



void vcc_insert_socket(struct sock *sk);
@@ -510,6 +518,15 @@ void register_atm_ioctl(struct atm_ioctl *); 
 */

void deregister_atm_ioctl(struct atm_ioctl *);





/* register_atmdevice_notifier - register atm_dev notify events

 *

 * Clients like br2684 will register notify events

 * Currently we notify of signal found/lost

 */

int register_atmdevice_notifier(struct notifier_block *nb);

void unregister_atmdevice_notifier(struct notifier_block *nb);



#endif /* __KERNEL__ */



#endif

net/atm/common.c

+30 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ EXPORT_SYMBOL(vcc_hash); 
DEFINE_RWLOCK(vcc_sklist_lock);

EXPORT_SYMBOL(vcc_sklist_lock);



static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);



static void __vcc_insert_socket(struct sock *sk)

{

	struct atm_vcc *vcc = atm_sk(sk);
@@ -212,6 +214,22 @@ void vcc_release_async(struct atm_vcc *vcc, int reply) 
}

EXPORT_SYMBOL(vcc_release_async);



void atm_dev_signal_change(struct atm_dev *dev, char signal)

{

	pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",

		__func__, signal, dev, dev->number, dev->signal);



	/* atm driver sending invalid signal */

	WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);



	if (dev->signal == signal)

		return; /* no change */



	dev->signal = signal;



	atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);

}

EXPORT_SYMBOL(atm_dev_signal_change);



void atm_dev_release_vccs(struct atm_dev *dev)

{
@@ -781,6 +799,18 @@ int vcc_getsockopt(struct socket *sock, int level, int optname, 
	return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);

}



int register_atmdevice_notifier(struct notifier_block *nb)

{

	return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);

}

EXPORT_SYMBOL_GPL(register_atmdevice_notifier);



void unregister_atmdevice_notifier(struct notifier_block *nb)

{

	atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);

}

EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);



static int __init atm_init(void)

{

	int error;

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