Commit:     17951f34b0970b05e29fd93a5b93fa05ec71308b
Parent:     df180e369cf54a8ef8440667ab1d13d452fc7215
Author:     Satyam Sharma <[EMAIL PROTECTED]>
AuthorDate: Fri Aug 10 15:33:01 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 16:48:05 2007 -0700

    [NET] netconsole: Introduce netconsole_netdev_notifier
    Based upon initial work by Keiichi Kii <[EMAIL PROTECTED]>.
    To update fields of underlying netpoll structure at runtime on corresponding
    ioctl(SIOCSIFHWADDR or SIOCSIFNAME) could be used to change the hardware/MAC
    address or name of the local interface that our netpoll is attached to.
    Whenever this happens, netdev notifier chain is called out with the
    NETDEV_CHANGEADDR or NETDEV_CHANGENAME event message.  We respond to that 
    update the local_mac or dev_name field of the struct netpoll.  This makes
    sense anyway, but is especially required for dynamic netconsole because the
    netpoll structure's internal members become user visible files when either
    sysfs or configfs are used.  So this helps us to keep up with the MAC
    address/name changes and keep values in struct netpoll uptodate.
    [ Note that ioctl(SIOCSIFADDR) to change IP address of interface at
      runtime is not handled (to update local_ip of netpoll) on purpose --
      some setups may set the local_ip to a private address, not necessary
      the actual IP address of the sender host, as presently allowed. ]
    Signed-off-by: Satyam Sharma <[EMAIL PROTECTED]>
    Signed-off-by: Keiichi Kii <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
 drivers/net/netconsole.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index be15ca6..5557098 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -80,6 +80,33 @@ static struct netconsole_target default_target = {
+/* 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 (nt-> == 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;
+               }
+       }
+       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;
@@ -122,6 +149,10 @@ static int __init init_netconsole(void)
        if (err)
                goto out;
+       err = register_netdevice_notifier(&netconsole_netdev_notifier);
+       if (err)
+               goto out;
        printk(KERN_INFO "netconsole: network logging started\n");
@@ -134,6 +165,7 @@ static void __exit cleanup_netconsole(void)
        struct netconsole_target *nt = &default_target;
+       unregister_netdevice_notifier(&netconsole_netdev_notifier);
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