linux-kernel - Re: Calgary and bad_dma

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Date:	Wed, 10 Sep 2008 12:38:25 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	zaitcev@...hat.com
Cc:	jdmason@...zu.us, muli@...ibm.com, linux-kernel@...r.kernel.org
Subject: Re: Calgary and bad_dma_address

On Tue, 9 Sep 2008 21:19:41 -0600
Pete Zaitcev <zaitcev@...hat.com> wrote:

> Hi, guys:
> 
> I was reading arch/x86/kernel/pci-calgary_64.c today, and noticed that
> apparently nothing prevents iommu_area_alloc from returning a zero.
> But bad_dma_address is zero too. Doesn't it concern anyone?
> If the first allocation asks for a page-aligned buffer to be mapped,
> a spurious bad address will result, if I understand this right.

Does calgary_reserve_regions() prevent that?
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