linux-kernel - Re: [PATCH] drm/prime: fix extracting of the DMA addresses from a scatterlist

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Date:   Fri, 27 Mar 2020 10:25:04 +0000
From:   Shane Francis <bigbeeshane@...il.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Maling list - DRI developers <dri-devel@...ts.freedesktop.org>,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>,
        "Michael J . Ruhl" <michael.j.ruhl@...el.com>
Subject: Re: [PATCH] drm/prime: fix extracting of the DMA addresses from a scatterlist

Hello Marek,

On Fri, Mar 27, 2020 at 9:00 AM Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
> > I have tested the above patch against my original issues with amdgpu
> > and radeon drivers and everything is still working as expected.
> >
> > Sorry I missed this in my original patches.
>
> No problem. Thanks for testing!
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
Just a thought.

Would it be worth adding some comments to the code to explain why this
is needed, reading
the thread around my original patches and the DMA-API documentation it
is not instantly
clear why you would be mapping the pages in this way.

Would probably prevent someone in the future making the same mistake I
did while updating
this code.

Regards,

Shane Francis