[PATCH v3 1/2] drm/gem: drm_gem_dumb_map_offset(): reject dma-buf

[Thierry Reding]

On Thu, Aug 17, 2017 at 06:21:30PM +0200, Noralf Trønnes wrote:
> Reject mapping an imported dma-buf since is's an invalid use-case.
> 
> Cc: Philipp Zabel <p.zabel at pengutronix.de>
> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Cc: Sean Paul <seanpaul at chromium.org>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
> ---
>  drivers/gpu/drm/drm_gem.c | 6 ++++++
>  1 file changed, 6 insertions(+)

I'm not sure we've documented exactly why this is an invalid use-case.
Perhaps that's something we should do along with this patch, or maybe
as a follow-up.

Either way, I think this is a good idea, so:

Acked-by: Thierry Reding <treding at nvidia.com>
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