linux-kernel - Re: [Bug 487894] New: sky2 0000:06:00.0: DMA-API: device driver frees DMA memory with different size

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Message-Id: <20090402200634I.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 2 Apr 2009 20:06:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	shemminger@...tta.com, davej@...hat.com, tglx@...uxtronix.de,
	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [Bug 487894] New: sky2 0000:06:00.0: DMA-API: device driver
	frees DMA memory with different size

On Thu, 2 Apr 2009 12:54:15 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> On Wed, Apr 01, 2009 at 11:02:45AM -0700, Stephen Hemminger wrote:
> > 
> > The sky2 driver uses pci_unmap_len and pci_unmap_len_set which on 32 bit
> > platforms are meaningless so they are stubbed out. 
> > Basically, DMA-API checks are wrong/bogus to enforce on 32bit x86 as is.
> 
> As far as I know the VT-d driver is available on 32 bit x86 too. So this should
> not always be a nop.

VT-d is available on only x86_64.

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