linux-kernel - Re: [PATCH] intel-iommu: Obey coherent_dma_mask for alloc

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Date:	Tue, 10 Nov 2009 01:01:46 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Alex Williamson <alex.williamson@...com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] intel-iommu: Obey coherent_dma_mask for alloc_coherent
 on passthrough

On Tue, 2009-11-10 at 00:46 +0000, David Woodhouse wrote:
> 
>         if (iommu_no_mapping(hwdev))
> -               return paddr;
> +               return paddr > dma_mask - size ? 0 : paddr; 

Hm, that's still wrong. If your mask is 0xffffffff and you map
0xfffff000 + 0x1000, that should be allowed, right? How about:

	return paddr <= dma_mask - size + 1 ? paddr : 0;

And is this strictly necessary as part of the patch we're discussing?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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