[PATCH] (4/4) dlci netdevice event handling

[Stephen Hemminger <shemminger@xxxxxxxx>]

Since dlci device is a pseudo device built on top of sdla, change it to
handle unregister events and delete itself.

diff -Nru a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
--- a/drivers/net/wan/dlci.c    Mon Sep  8 14:03:04 2003
+++ b/drivers/net/wan/dlci.c    Mon Sep  8 14:03:04 2003
@@ -509,20 +509,46 @@
 
 }
 
-int __init init_dlci(void)
+/* if slave is unregistering, then cleanup master */
+static int dlci_dev_event(struct notifier_block *unused,
+                         unsigned long event, void *ptr)
+{
+       struct net_device *dev = (struct net_device *) ptr;
+
+       if (event == NETDEV_UNREGISTER) {
+               struct dlci_local *dlp;
+
+               list_for_each_entry(dlp, &dlci_devs, list) {
+                       if (dlp->slave == dev) {
+                               unregister_netdevice(dlp->master);
+                               dev_put(dlp->slave);
+                               break;
+                       }
+               }
+       }
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block dlci_notifier = {
+       .notifier_call = dlci_dev_event,
+};
+
+static int __init init_dlci(void)
 {
        dlci_ioctl_set(dlci_ioctl);
+       register_netdevice_notifier(&dlci_notifier);
 
        printk("%s.\n", version);
 
        return 0;
 }
 
-void __exit dlci_exit(void)
+static void __exit dlci_exit(void)
 {
        struct dlci_local       *dlp, *nxt;
        
        dlci_ioctl_set(NULL);
+       unregister_netdevice_notifier(&dlci_notifier);
 
        rtnl_lock();
        list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {