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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Date:	Thu, 2 Apr 2009 13:18:39 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
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, Apr 02, 2009 at 08:06:26PM +0900, FUJITA Tomonori wrote:
> 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.

At least there was a patch to enable it on 32 bit too. See

https://lists.linux-foundation.org/pipermail/iommu/2009-February/001080.html

It seems not to be upstream yet.

	Joerg

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