drm: add unpin function to prime helpers

Prevents buffers from being pinned forever.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index b06f5afe10ce..57f60a743da0 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -930,6 +930,7 @@ struct drm_driver {
                                 struct dma_buf *dma_buf);
         /* low-level interface used by drm_gem_prime_{import,export} */
         int (*gem_prime_pin)(struct drm_gem_object *obj);
+        void (*gem_prime_unpin)(struct drm_gem_object *obj);
         struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
         struct drm_gem_object *(*gem_prime_import_sg_table)(
                                 struct drm_device *dev, size_t size,