diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index a0441f7cf2b4..147e89e25518 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -525,11 +525,11 @@ int drm_dev_init(struct drm_device *dev,
 		}
 	}
 
-	if (parent) {
-		ret = drm_dev_set_unique(dev, dev_name(parent));
-		if (ret)
-			goto err_setunique;
-	}
+	/* Use the parent device name as DRM device unique identifier, but fall
+	 * back to the driver name for virtual devices like vgem. */
+	ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name);
+	if (ret)
+		goto err_setunique;
 
 	return 0;
 
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 11eda9050215..b7f7d968e4cd 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -135,12 +135,7 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 			return ret;
 		}
 	} else {
-		if (WARN(dev->unique == NULL,
-			 "No drm_driver.set_busid() implementation provided by "
-			 "%ps. Use drm_dev_set_unique() to set the unique "
-			 "name explicitly.", dev->driver))
-			return -EINVAL;
-
+		WARN_ON(!dev->unique);
 		master->unique = kstrdup(dev->unique, GFP_KERNEL);
 		if (master->unique)
 			master->unique_len = strlen(dev->unique);