drm/udl: Remove udl implementation of GEM's free_object()

Udl's custom implementation for struct drm_gem_object_funcs.free_object
unmaps perma-mapped memory buffer before freeing the buffer object.

After switching to generic fbdev emulation and fixing the damage
handler, no perma-mapped buffers have to be released. Switch to SHMEM's
implementation of free_object.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114141025.32198-3-tzimmermann@suse.de

drivers/gpu/drm/udl/udl_gem.c

@@ -17,22 +17,6 @@
  * GEM object funcs
  */
 
-static void udl_gem_object_free_object(struct drm_gem_object *obj)
-{
-	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
-
-	/* Fbdev emulation vmaps the buffer. Unmap it here for consistency
-	 * with the original udl GEM code.
-	 *
-	 * TODO: Switch to generic fbdev emulation and release the
-	 *       GEM object with drm_gem_shmem_free_object().
-	 */
-	if (shmem->vaddr)
-		drm_gem_shmem_vunmap(obj, shmem->vaddr);
-
-	drm_gem_shmem_free_object(obj);
-}
-
 static int udl_gem_object_mmap(struct drm_gem_object *obj,
 			       struct vm_area_struct *vma)
 {
@@ -91,7 +75,7 @@ static void *udl_gem_object_vmap(struct drm_gem_object *obj)
 }
 
 static const struct drm_gem_object_funcs udl_gem_object_funcs = {
-	.free = udl_gem_object_free_object,
+	.free = drm_gem_shmem_free_object,
 	.print_info = drm_gem_shmem_print_info,
 	.pin = drm_gem_shmem_pin,
 	.unpin = drm_gem_shmem_unpin,