linux-kernel - Re: [PATCH] x86-64: pci-gart iommu sg chaining zeroes wrong sg.

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Message-Id: <20070928014634H.tomof@acm.org>
Date:	Fri, 28 Sep 2007 01:46:36 +0900
From:	FUJITA Tomonori <tomof@....org>
To:	jens.axboe@...cle.com
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH] x86-64: pci-gart iommu sg chaining zeroes wrong sg.

On Fri, 28 Sep 2007 01:38:27 +0900
FUJITA Tomonori <tomof@....org> wrote:

> This patch is for Jens' block tree (sg chaining branch).
> 
> I don't have the hardware but this looks like a bug.
> 
> ---
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] x86-64: pci-gart iommu sg chaining zeroes a wrong sg's dma_length
> 
> Needs to zero the end of the list.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  arch/x86_64/kernel/pci-gart.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
> index 27b7db4..a4151a7 100644
> --- a/arch/x86_64/kernel/pci-gart.c
> +++ b/arch/x86_64/kernel/pci-gart.c
> @@ -425,9 +425,10 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
>  	if (dma_map_cont(start_sg, i - start, sgmap, pages, need) < 0)
>  		goto error;
>  	out++;
> +	sgmap = sg_next(sgmap);
>  	flush_gart();
>  	if (out < nents)
> -		ps->dma_length = 0;
> +		sgmap->dma_length = 0;
>  	return out;

Sorry, it should be:


diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 27b7db4..cfcc84e 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -426,8 +426,10 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
 		goto error;
 	out++;
 	flush_gart();
-	if (out < nents)
-		ps->dma_length = 0;
+	if (out < nents) {
+		sgmap = sg_next(sgmap);
+		sgmap->dma_length = 0;
+	}
 	return out;
 
 error:
-
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