netdev - Re: 24rc8: unregister_netdevice: waiting for ... to become free

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Message-Id: <20080502.054536.109642865.davem@davemloft.net>
Date:	Fri, 02 May 2008 05:45:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	devzero@....de
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, g4klx@...lx.demon.co.uk
Subject: Re: 24rc8: unregister_netdevice: waiting for ... to become free

From: "Roland" <devzero@....de>
Date: Fri, 2 May 2008 14:38:36 +0200

> it seems it`s lapbether driver
> 
> reproduce:
> 
> on system with pcnet32 (vmware) do
> 
> modprobe pcnet32
> modprobe lapbether
> modprobe -r lapbether
> modprobe -r pcnet32 -> hang -> unregister_netdevice: waiting for eth0 to 
> become free

lapbeth_cleanup_driver() unregisters the netdevice, but does not
release the reference to lapbeth->ethdev in those device instances.

Once this happens, and the lapbeth_dev_notifier is unregistered,
these references will leak forever.
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