linux-kernel - Re: [PATCH] media: uvcvideo: Use streaming DMA APIs to transfer buffers

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Date:   Mon, 30 Sep 2019 23:37:44 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Shik Chen <shik@...omium.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>, notify@...nel.org,
        Keiichi Watanabe <keiichiw@...omium.org>,
        Ricky Liang <jcliang@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        lkml <linux-kernel@...r.kernel.org>,
        kieran.bingham@...asonboard.com, Vlastimil Babka <vbabka@...e.cz>,
        Christoph Lameter <cl@...ux.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] media: uvcvideo: Use streaming DMA APIs to transfer
 buffers

On Mon, Sep 30, 2019 at 01:23:10AM -0700, Christoph Hellwig wrote:
> And drivers really have no business looking at the dma mask.  I have
> a plan for dma_alloc_pages API that could replace that cruft, but
> until then please use GFP_KERNEL and let the dma subsystem bounce
> buffer if needed.

Can you try this series:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma_alloc_pages

and see if it does whay you need for usb?