Messages in this thread | | | Date | Tue, 4 Sep 2012 15:55:16 +0100 | From | David Vrabel <> | Subject | Re: [Xen-devel] [PATCH 1/1] XEN: Use correct masking in xen_swiotlb_alloc_coherent. |
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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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