linux-kernel - Re: [PATCH v2 -resend#1 1/1] V4L: videobuf, don't use dma addr as physical

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Message-ID: <4D6BC3AE.903@suse.cz>
Date:	Mon, 28 Feb 2011 16:47:58 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	mchehab@...radead.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com
Subject: Re: [PATCH v2 -resend#1 1/1] V4L: videobuf, don't use dma addr as
 physical

On 02/28/2011 03:53 PM, Konrad Rzeszutek Wilk wrote:
> On Mon, Feb 28, 2011 at 10:37:02AM +0100, Jiri Slaby wrote:
>> mem->dma_handle is a dma address obtained by dma_alloc_coherent which
>> needn't be a physical address in presence of IOMMU. So ensure we are
> 
> Can you add a comment why you are fixing it? Is there a bug report for this?
> Under what conditions did you expose this fault?

No, by a just peer review when I was looking for something completely
different.

> You also might want to mention that "needn't be a physical address as
> a hardware IOMMU can (and most likely) will return a bus address where
> physical != bus address."

Mauro, do you want me to resend this with such an udpate in the changelog?

> Otherwise you can stick 'Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>'
> on it.

thanks,
-- 
js
suse labs
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