fix a layering violation in videobuf2 and improve dma_map_resource v2

[Marek Szyprowski]

Hi All,

On 2019-01-18 12:37, Christoph Hellwig wrote:
> Hi all,
>
> this series fixes a rather gross layering violation in videobuf2, which
> pokes into arm DMA mapping internals to get a DMA address for memory that
> does not have a page structure, and to do so fixes up the dma_map_resource
> implementation to not provide a somewhat dangerous default and improve
> the error handling.
>
> Changes since v1:
>  - don't apply bus offsets in dma_direct_map_resource

Works fine on older Exynos based boards with IOMMU and CMA disabled.

Tested-by: Marek Szyprowski <m.szyprowski at samsung.com>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland