linux-kernel - Re: [PATCH 2/3 v2] sh: fix DMA driver's descriptor chaining and cookie assignment

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Date:	Thu, 17 Dec 2009 17:33:53 +0900
From:	Nobuhiro Iwamatsu <iwamatsu@...auri.org>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH 2/3 v2] sh: fix DMA driver's descriptor chaining and 
	cookie assignment

HI,

2009/12/17 Guennadi Liakhovetski <g.liakhovetski@....de>:
> Hello Iwamatsu-san
>
> On Thu, 17 Dec 2009, Nobuhiro Iwamatsu wrote:
>
>> Hi,
>>
>> 2009/12/12 Nobuhiro Iwamatsu <iwamatsu@...auri.org>:
>> > Hi,
>> >
>> > Oh, I was going to check an old patch.
>> >
>> > 2009/12/11 Paul Mundt <lethal@...ux-sh.org>:
>> >> On Thu, Dec 10, 2009 at 06:35:11PM +0100, Guennadi Liakhovetski wrote:
>> >>> The SH DMA driver wrongly assigns negative cookies to transfer descriptors,
>> >>> also, its chaining of partial descriptors is broken. The latter problem is
>> >>> usually invisible, because maximum transfer size per chunk is 16M, but if you
>> >>> artificially set this limit lower, the driver fails. Since cookies are also
>> >>> used in chunk management, both these problems are fixed in one patch. As side
>> >>> effects a possible memory leak, when descriptors are prepared, but not
>> >>> submitted, and multiple races have also been fixed.
>> >>>
>> >>> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
>> >>
>> >> Looks good to me.
>> > Me too.
>> >
>> > But I want to check other CPU of sh. I will do next week.
>> > Please wait "Acked-by".
>> >
>> >
>>
>> I tested this patch. But I can not apply to Paul's git/HEAD.
>> I re-create patch and I attached.
>> This version of patch work fine.
>> Guennadi, could you test this patch on sh7724?
>
> Thanks for testing. I looked at your version of my patch, and I don't
> agree with it. You needlessly changed indentation in it and also forgot to
> include a "From: " line in it to indicate its original authorship.
> Besides, I think, Dan will be applying this patch on top of current next
> or Linus' tree. Of course, it can be, that my version of the patch does
> not apply to those trees either now. So, Dan, if you cannot merge my
> version of this patch yourself, please, let me know, I'll rebase it, but
> please do not use this version.

Yes, you are right.
And sorry, I am not going to seize your patch by force.
I sent the patch which I revised at hand.

Best regards,
  Nobuhiro

-- 
Nobuhiro Iwamatsu
   iwamatsu at {nigauri.org / debian.org}
   GPG ID: 40AD1FA6
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