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

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Message-ID: <50461A59.2050504@citrix.com>
Date:	Tue, 4 Sep 2012 16:12:25 +0100
From:	Stefano Panella <stefano.panella@...rix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.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 09/04/2012 03:55 PM, David Vrabel wrote:
> 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
Sorry David, I am not completely sure I understand your argument in 
favour of a bug in the
sound system or Intel HDA device driver. Could you please elaborate more 
in detail about this?

Thanks,

Stefano
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