[PATCH -mm 4/9] netconsole: Introduce netconsole_netdev_notifier

[Satyam Sharma]

From: Satyam Sharma <[EMAIL PROTECTED]>

[4/9] netconsole: Introduce netconsole_netdev_notifier

To update fields of underlying netpoll structure at runtime on
corresponding NETDEV_CHANGEADDR or NETDEV_CHANGENAME notifications.

Signed-off-by: Satyam Sharma <[EMAIL PROTECTED]>
Cc: Keiichi Kii <[EMAIL PROTECTED]>
Cc: Takayoshi Kochi <[EMAIL PROTECTED]>

---

 drivers/net/netconsole.c |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

---

diff -ruNp a/drivers/net/netconsole.c b/drivers/net/netconsole.c
--- a/drivers/net/netconsole.c  2007-07-03 21:51:40.000000000 +0530
+++ b/drivers/net/netconsole.c  2007-07-03 22:02:11.000000000 +0530
@@ -81,6 +81,37 @@ static struct netconsole_target default_
        },
 };
 
+/* Handle network interface device notifications */
+static int netconsole_netdev_event(struct notifier_block *this,
+                                  unsigned long event,
+                                  void *ptr)
+{
+       struct net_device *dev = ptr;
+       struct netconsole_target *nt = &default_target;
+
+       if (!(event == NETDEV_CHANGEADDR || event == NETDEV_CHANGENAME))
+               goto done;
+
+       if (nt->np.dev == dev) {
+               switch (event) {
+               case NETDEV_CHANGEADDR:
+                       memcpy(nt->np.local_mac, dev->dev_addr, ETH_ALEN);
+                       break;
+
+               case NETDEV_CHANGENAME:
+                       strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
+                       break;
+               }
+       }
+
+done:
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block netconsole_netdev_notifier = {
+       .notifier_call  = netconsole_netdev_event,
+};
+
 static void write_msg(struct console *con, const char *msg, unsigned int len)
 {
        int frag, left;
@@ -123,6 +154,10 @@ static int __init init_netconsole(void)
        if (err)
                goto out;
 
+       err = register_netdevice_notifier(&netconsole_netdev_notifier);
+       if (err)
+               return err;
+
        register_console(&netconsole);
        printk(KERN_INFO "netconsole: network logging started\n");
 
@@ -135,6 +170,7 @@ static void __exit cleanup_netconsole(vo
        struct netconsole_target *nt = &default_target;
 
        unregister_console(&netconsole);
+       unregister_netdevice_notifier(&netconsole_netdev_notifier);
        netpoll_cleanup(&nt->np);
 }
 
-
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