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

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Message-ID: <20090613111014.GA18638@8bytes.org>
Date:	Sat, 13 Jun 2009 13:10:14 +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 Fri, Jun 12, 2009 at 04:51:01PM +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?
> 
> Hmm... There isn't a get_nr_mapped_entries() in 2.6.30.
> Are these patches again the current linus tree?

Indeed. These patches are against tip/core/iommu but should also apply
against current linus/master too.

> For unfilled information I wanted to complain that for non-sg mapping
> sg_call_ents never gets filled. But as dma_entry_alloc() does a
> memset() to clean the entrys it should not matter.
> And what about dma_debug_entry.paddr? Should this also be compared?

paddr shouldn't matter. We also can't compare against it because it is
not a parameter we get in the unmap path (not always).

Joerg

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