linux-kernel - Re: USB related "unable to handle kernel paging request" in 3.0.0-rc7

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Message-ID: <20110802135117.3f13c1bc@schatten.dmk.lab>
Date:	Tue, 2 Aug 2011 13:51:17 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Florian Mickler <florian@...kler.org>
Cc:	Dan Carpenter <error27@...il.com>, linux-kernel@...r.kernel.org,
	Tino Keitel <tino.keitel@...ei.de>, mchehab@...radead.org
Subject: Re: USB related "unable to handle kernel paging request" in
 3.0.0-rc7

On Tue, 2 Aug 2011 13:10:39 +0200
Florian Mickler <florian@...kler.org> wrote:

> On Tue, 2 Aug 2011 12:40:28 +0200
> Florian Mickler <florian@...kler.org> wrote:
> 
> > This should fix it. 
> > 
> Tino, can you test if this also fixes your bug since
>  I don't have the hardware. 
> 
> At the moment I'm not seeing how the screwup Dan pointed out could
> have that effect though... ? The priv-buffer-pointer would have
> been simply overriden in the probe routine by the new buffer and it
> should have worked happily everafter (until the driver disconnect
> routine would have been called...) *headscratch*
> 
> Regards,
> Flo

ok. I see the problem now. The buffer get's initialzed a little bit too late
because it already get's used from the dvb_usb_device_init call via the
frontend attach call:

dvb_usb_device_init->dvb_usb_init->dvb_usb_adapter_init->dvb_usb_adapter_frontend_init->vp7045_frontend_attach->vp7045_usb_op 

Hm.. let me think about it. In the meantime, you don't need to test
this 'fix'.

Regards,
Flo
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