linux-kernel - Re: [PATCH 1/3] x86: remove the NULL device hack in dma-mapping.h

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Date:	Thu, 04 Sep 2008 17:53:19 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	joro@...tes.org, linux-kernel@...r.kernel.org, tony.luck@...el.com,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 1/3] x86: remove the NULL device hack in dma-mapping.h

FUJITA Tomonori wrote:
> On Wed, 3 Sep 2008 22:01:14 +0200
> Joerg Roedel <joro@...tes.org> wrote:
> 
>> On Thu, Sep 04, 2008 at 03:04:23AM +0900, FUJITA Tomonori wrote:
>>> +static void *x86_swiotlb_alloc_coherent(struct device *dev, size_t size,
>>> +					dma_addr_t *dma_handle, gfp_t gfp)
>>> +{
>>> +	if (!dev) {
>>> +		dev = &x86_dma_fallback_dev;
>>> +		gfp |= GFP_DMA;
>>> +	}
>> This really should be checked in the generic x86 dma_alloc_coherent
>> function.
> 
> I don't think so. Any motherboards with the recent IOMMUs support ISA?

Probably some LPC devices on those boards..
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