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

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Message-Id: <20190118113727.3270-1-hch@lst.de>
Date:   Fri, 18 Jan 2019 12:37:24 +0100
From:   Christoph Hellwig <hch@....de>
To:     Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.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: fix a layering violation in videobuf2 and improve dma_map_resource v2

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