From 2382b15bcc39228572ccf1d9a1185dcabb84c833 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bruno=20Pr=C3=A9mont?= Date: Wed, 29 Apr 2009 20:45:17 +0000 Subject: [PATCH] netconsole: take care of NETDEV_UNREGISTER event MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Acked-by: Matt Mackall Signed-off-by: David S. Miller --- drivers/net/netconsole.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index eceadf787a67..bf4af5248cb7 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -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);