linux-kernel - Re: [PATCH] dma-debug: disable DMA_API

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Message-ID: <20090615074616.GD18638@8bytes.org>
Date:	Mon, 15 Jun 2009 09:46:17 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...e.hu,
	lethal@...ux-sh.org, hancockrwd@...il.com, jens.axboe@...cle.com,
	bharrosh@...asas.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH] dma-debug: disable DMA_API_DEBUG for now

On Sat, Jun 13, 2009 at 07:08:01PM +0200, Torsten Kaiser wrote:
> On Fri, Jun 12, 2009 at 4:13 PM, Joerg Roedel<joerg.roedel@....com> wrote:
> > On Thu, Jun 11, 2009 at 07:38:47PM +0200, Torsten Kaiser wrote:
> >> DMA-API: device driver tries to free DM
> >> A memory it has not allocated [device address=0x000000011e4c3000]
> >> [size=4096 bytes]
> >
> > Hmm, looking again over the code I've seen that the ref
> > dma_debug_entries are not alway filled with all necessary information
> > for best-fit. Can you please try if you still get false warnings when
> > you apply the two patches attached instead of the one I sent yesterday?
> 
> I tested these patches
> (0001-dma-debug-check-for-sg_call_ents-in-best-fit-algorit.patch and
> 0002-dma-debug-be-more-careful-when-building-reference-en.patch)
> against 2.6.30-git6 and did not see any warnings.
> 
> I can't be 100% sure about the fix, because I do not have a reliable
> trigger, but it looks quite good.

Ok cool, I will push these two patches upstream then and will send them
to -stable too. So we get this fixed in a 30.x release too. Thanks a lot
for your testing.

	Joerg

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