linux-kernel - Re: [PATCH 2.6.21-rc4] ieee1394: fix oops on "modprobe -r ohci1394" after network class

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Date:	Tue, 20 Mar 2007 16:34:32 -0700
From:	Greg KH <greg@...ah.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux-kernel@...r.kernel.org,
	linux1394-devel@...ts.sourceforge.net,
	Ismail D?nmez <ismail@...dus.org.tr>,
	Adrian Bunk <bunk@...sta.de>, Thomas Meyer <thomas@...3r.de>,
	Tobias Diedrich <ranma@...edrich.de>
Subject: Re: [PATCH 2.6.21-rc4] ieee1394: fix oops on "modprobe -r ohci1394" after network class_device conversion

On Tue, Mar 20, 2007 at 10:43:22PM +0100, Stefan Richter wrote:
> The networking subsystem has been converted from class_device to device
> but ieee1394 hasn't.  This results in a 100% reproducible NULL pointer
> dereference if the ohci1394 driver module is unloaded while the eth1394
> module is still loaded.
> http://lkml.org/lkml/2006/11/16/147
> http://lkml.org/lkml/2007/3/14/4
> 
> This is a regression in 2.6.21-rc1.
> 
> Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
> ---
> 
> Works for me.  I still can connect to an OS X box via eth1394 after that
> and modprobe -r ohci1394 before modprobe -r eth1394 works again.
> 
> Index: linux-2.6.21-rc4/drivers/ieee1394/eth1394.c
> ===================================================================
> --- linux-2.6.21-rc4.orig/drivers/ieee1394/eth1394.c	2007-03-16 19:24:44.000000000 +0100
> +++ linux-2.6.21-rc4/drivers/ieee1394/eth1394.c	2007-03-20 22:28:49.000000000 +0100
> @@ -586,7 +586,10 @@ static void ether1394_add_host (struct h
>          }
>  
>  	SET_MODULE_OWNER(dev);
> +#if 0
> +	/* FIXME - Is this the correct parent device anyway? */
>  	SET_NETDEV_DEV(dev, &host->device);
> +#endif

That's interesting.  What does 'tree /sys/class/net/' look like with
this patch applied?  Does the eth1394 device now live off in
/sys/device/virtual?

If so, I guess this is ok for now as we can wait for the rewrite of the
ieee1394 subsystem to get the linking done correctly :)

thanks,

greg k-h
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