Re: fix a layering violation in videobuf2 and improve dma_map_resource v2

From: Marek Szyprowski
Date: Fri Feb 01 2019 - 02:05:33 EST

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@xxxxxxxxxxx>

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