Revert "drm/amdgpu: validate user GEM object size"

It was at the same time too strict (for linear tiling modes, where no
height alignment is required) and too lenient (for 2D tiling modes,
where height may need to be aligned to values > 8).
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

@@ -531,7 +531,6 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
 	struct drm_gem_object *obj;
 	struct amdgpu_framebuffer *amdgpu_fb;
 	int ret;
-	int height;
 	struct amdgpu_device *adev = dev->dev_private;
 	int cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0);
 	int pitch = mode_cmd->pitches[0] / cpp;
@@ -556,13 +555,6 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	height = ALIGN(mode_cmd->height, 8);
-	if (obj->size < pitch * height) {
-		DRM_DEBUG_KMS("Invalid GEM size: expecting >= %d but got %zu\n",
-			      pitch * height, obj->size);
-		return ERR_PTR(-EINVAL);
-	}
-
 	amdgpu_fb = kzalloc(sizeof(*amdgpu_fb), GFP_KERNEL);
 	if (amdgpu_fb == NULL) {
 		drm_gem_object_put_unlocked(obj);