linux-kernel - Re: [media] dib0700: get rid of on-stack dma buffers

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Date:	Fri, 29 Apr 2011 18:32:34 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Patrick Boettcher <pboettcher@...nellabs.com>
CC:	Florian Mickler <florian@...kler.org>, oliver@...kum.org,
	linux-kernel@...r.kernel.org,
	Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [media] dib0700: get rid of on-stack dma buffers

Em 04-04-2011 04:42, Patrick Boettcher escreveu:
> Hi Florian,
> 
> On Sun, 3 Apr 2011, Florian Mickler wrote:
> 
>> Hi,
>>
>> since I got no reaction[1] on the vp702x driver, I proceed with the
>> dib0700.
>>
>> There are multiple drivers in drivers/media/dvb/dvb-usb/ which use
>> usb_control_msg to perform dma to stack-allocated buffers. This is a bad idea
>> because of cache-coherency issues and on some platforms the stack is mapped
>> virtually and also lib/dma-debug.c warn's about it at runtime.
>>
>> Patches to ec168, ce6230, au6610 and lmedm04 were already tested and reviewed
>> and submitted for inclusion [2]. Patches to a800, vp7045, friio, dw2102, m920x
>> and opera1 are still waiting for for review and testing [3].
>>
>> This patch to dib0700 is a fix for a warning seen and reported by Zdenek
>> Kabalec in Bug #15977 [4].
>>
>> Florian Mickler (2):
>>      [media] dib0700: get rid of on-stack dma buffers
> 
> For this one we implemented an alternative. See here:
> 
> http://git.linuxtv.org/pb/media_tree.git?a=commit;h=16b54de2d8b46e48c5c8bdf9b350eac04e8f6b46
> 
> which I pushed, but obviously forgot to send the pull-request.
> 
> This is done now.

And I obviously forgot to pick ;) Ok, I'm applying Oliver Grenie's version and
marking Florian's version as superseded at patchwork.

> For the second patch I will incorperate it as soon as I find the time.

As it is a trivial fix, I'll be picking it directly.

> 
> best regards,
> -- 
> 
> Patrick
> -- 
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