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Subject[PATCH -mm 4/9] netconsole: Introduce netconsole_netdev_notifier
From: Satyam Sharma <ssatyam@cse.iitk.ac.in>

[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 <ssatyam@cse.iitk.ac.in>
Cc: Keiichi Kii <k-keiichi@bx.jp.nec.com>
Cc: Takayoshi Kochi <t-kochi@bq.jp.nec.com>

---
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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