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netconsole: take care of NETDEV_UNREGISTER event 

When netconsole is loaded and a network interface fades away (e.g. on
rmmod $interface_driver_module) the rmmod remains stuck and some locks
are taken that prevent any additional module loading/unloading as well
as interface up/down changes.
In addition kernel logs (and console) get flooded at 10s interval with

[  122.464065] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[  132.704059] unregister_netdevice: waiting for eth0 to become free. Usage count = 1

This patch lets netconsole take NETDEV_UNREGISTER event into account
and release the affected interface if it was in use.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruno Prémont 2009-04-29 20:45:17 +00:00 committed by David S. Miller
parent acda074390
commit 2382b15bcc
1 changed files with 10 additions and 1 deletions
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11
drivers/net/netconsole.c
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@ -664,7 +664,7 @@ static int netconsole_netdev_event(struct notifier_block *this,
struct netconsole_target *nt;
struct net_device *dev = ptr;
if (!(event == NETDEV_CHANGENAME))
if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER))
goto done;
spin_lock_irqsave(&target_list_lock, flags);
@ -675,6 +675,15 @@ static int netconsole_netdev_event(struct notifier_block *this,
case NETDEV_CHANGENAME:
strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
break;
case NETDEV_UNREGISTER:
if (!nt->enabled)
break;
netpoll_cleanup(&nt->np);
nt->enabled = 0;
printk(KERN_INFO "netconsole: network logging stopped"
", interface %s unregistered\n",
dev->name);
break;
}
}
netconsole_target_put(nt);