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

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Message-ID: <20110802140215.008ecfa6@schatten.dmk.lab>
Date:	Tue, 2 Aug 2011 14:02:15 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	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 14:35:54 +0300
Dan Carpenter <error27@...il.com> wrote:

> On Tue, Aug 02, 2011 at 12:40:28PM +0200, Florian Mickler wrote:
> > This should fix it. 
> > 
> 
> That's not right.  You should just make .size_of_priv = 20 with a
> comment.

Right. Don't know why I didn't do so right from the start. The thing
is, the buffer has to be seperately allocated from the heap in order
for it to be used as a dma target. 
I probably overlooked that that is what actually happens in
dvb_usb_device_init. Or realized and changed everything accordingly but
forgot the .size_of_priv. ? 

Anyway, that is what you get if you can't actually test what you do. 
(Sorry Tino! The original patch submission had a big fat warning
that it was only compile tested, but that got lost somewhere along
the line...) 

> 
> regards,
> dan carpenter
> 

Thx,
Flo
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