Unregister a network notifier block
int unregister_netdevice_notifier(struct notifier_block * nb);
nb
notifier
Unregister a notifier previously registered by register_netdevice_notifier. The notifier is unlinked into the kernel structures and may then be reused. A negative errno code is returned on a failure.
After unregistering unregister and down device events are synthesized for all devices on the device list to the removed notifier to remove the need for special case cleanup code.