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| author | Karl Hiramoto <karl@hiramoto.org> | 2010-07-08 20:55:30 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-09 00:09:20 -0700 |
| commit | 7313bb8f3dd6e28bcf9c42adfd54a5cf9a4949e0 (patch) | |
| tree | 65d8486a2ff4aabc23e0b021f068dd3788081923 /net/atm | |
| parent | 68dc9d36c19aa1fd1633427b419d5e1f44753e8a (diff) | |
| download | linux-3.10-7313bb8f3dd6e28bcf9c42adfd54a5cf9a4949e0.tar.gz linux-3.10-7313bb8f3dd6e28bcf9c42adfd54a5cf9a4949e0.tar.bz2 linux-3.10-7313bb8f3dd6e28bcf9c42adfd54a5cf9a4949e0.zip | |
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: Karl Hiramoto <karl@hiramoto.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/atm')
| -rw-r--r-- | net/atm/common.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/net/atm/common.c b/net/atm/common.c index b43feb1a399..940404a73b3 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -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; |