[PATCHv10 08/26] v4l: vb2-dma-contig: add support for scatterlist in userptr mode

[Pawel Osciak]

Hi Tomasz,

On Wed, Oct 10, 2012 at 7:46 AM, Tomasz Stanislawski
<t.stanislaws at samsung.com> wrote:
> This patch introduces usage of dma_map_sg to map memory behind
> a userspace pointer to a device as dma-contiguous mapping.
>

Perhaps I'm missing something, but I don't understand the purpose of
this patch. If the device can do DMA SG, why use videobuf2-dma-contig
and not videobuf2-dma-sg? What would be the difference design-wise
between them if this patch is merged?

-- 
Best regards,
Pawel Osciak