linux-kernel - Re: fix a layering violation in videobuf2 and improve dma_map

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Message-ID: <774dc557-b690-203f-898f-38755b099068@samsung.com>
Date:   Fri, 1 Feb 2019 08:05:21 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Christoph Hellwig <hch@....de>, Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Cc:     Russell King <linux@...linux.org.uk>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: fix a layering violation in videobuf2 and improve
 dma_map_resource v2

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@...sung.com>

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