drm/shmem-helpers: Ensure get_pages is not called on imported dma-buf
Just a bit of light paranoia. Also sprinkle this check over drm_gem_shmem_get_sg_table, which should only be called when exporting, same for the pin/unpin functions, on which it relies to work correctly. Acked-by:Thomas Zimmermann <tzimmermann@suse.de> Tested-by:
Boris Brezillon <boris.brezillon@collabora.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Rob Herring <robh@kernel.org> Cc: Noralf Trønnes <noralf@tronnes.org> Signed-off-by:
Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200511093554.211493-9-daniel.vetter@ffwll.ch
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