linux-kernel - Re: [Xen-devel] [PATCH 1/1] XEN: Use correct masking in xen_swiotlb_alloc

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Message-ID: <50461654.5040901@citrix.com>
Date:	Tue, 4 Sep 2012 15:55:16 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Panella <stefano.panella@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [Xen-devel] [PATCH 1/1] XEN: Use correct masking in xen_swiotlb_alloc_coherent.

On 04/09/12 15:37, Konrad Rzeszutek Wilk wrote:
> On Tue, Sep 04, 2012 at 03:07:42PM +0100, Stefano Panella wrote:
>> 
>> So if hwdev->coherent_dma_mask is set to 0xffffffffffffffff our dma_mask will
>> be u64 set to 0xffffffffffffffff even if we set it to DMA_BIT_MASK(32) previously.
> 
> That is what I was missing. Let me include that in the git commit and also
> put this patch on the stable tree.

Note that this appears to be a work around for a bug in the sound system
or Intel HDA device driver which is incorrectly truncating a dma_addr_t
to a u32.  So by ensuring a DMA_BIT_MASK(32) when the dma_addr_t is
truncated it still works.

David
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