diff --git a/drivers/gpu/drm/tests/drm_client_modeset_test.c b/drivers/gpu/drm/tests/drm_client_modeset_test.c
index 4d475ae6dbb6..053dbc0106d9 100644
--- a/drivers/gpu/drm/tests/drm_client_modeset_test.c
+++ b/drivers/gpu/drm/tests/drm_client_modeset_test.c
@@ -15,6 +15,7 @@
 
 struct drm_client_modeset_test_priv {
 	struct drm_device *drm;
+	struct device *dev;
 	struct drm_connector connector;
 };
 
@@ -59,7 +60,10 @@ static int drm_client_modeset_test_init(struct kunit *test)
 
 	test->priv = priv;
 
-	priv->drm = drm_kunit_helper_alloc_drm_device(test, DRIVER_MODESET);
+	priv->dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	priv->drm = drm_kunit_helper_alloc_drm_device(test, priv->dev, DRIVER_MODESET);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
 
 	ret = drmm_connector_init(priv->drm, &priv->connector,
@@ -76,6 +80,13 @@ static int drm_client_modeset_test_init(struct kunit *test)
 	return 0;
 }
 
+static void drm_client_modeset_test_exit(struct kunit *test)
+{
+	struct drm_client_modeset_test_priv *priv = test->priv;
+
+	drm_kunit_helper_free_device(test, priv->dev);
+}
+
 static void drm_test_pick_cmdline_res_1920_1080_60(struct kunit *test)
 {
 	struct drm_client_modeset_test_priv *priv = test->priv;
@@ -175,6 +186,7 @@ static struct kunit_case drm_test_pick_cmdline_tests[] = {
 static struct kunit_suite drm_test_pick_cmdline_test_suite = {
 	.name = "drm_test_pick_cmdline",
 	.init = drm_client_modeset_test_init,
+	.exit = drm_client_modeset_test_exit,
 	.test_cases = drm_test_pick_cmdline_tests
 };
 
diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index ec33fcbd092d..4bf98bd0a8c6 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -17,36 +17,51 @@ struct kunit_dev {
 static const struct drm_mode_config_funcs drm_mode_config_funcs = {
 };
 
-static int dev_init(struct kunit_resource *res, void *ptr)
+/**
+ * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
+ * @test: The test context object
+ *
+ * This allocates a fake struct &device to create a mock for a KUnit
+ * test.
+ *
+ * Callers need to make sure drm_kunit_helper_free_device() on the
+ * device when done.
+ *
+ * Returns:
+ * A pointer to the new device, or an ERR_PTR() otherwise.
+ */
+struct device *drm_kunit_helper_alloc_device(struct kunit *test)
 {
-	char *name = ptr;
-	struct device *dev;
-
-	dev = root_device_register(name);
-	if (IS_ERR(dev))
-		return PTR_ERR(dev);
-
-	res->data = dev;
-	return 0;
+	return root_device_register(KUNIT_DEVICE_NAME);
 }
+EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
 
-static void dev_free(struct kunit_resource *res)
+/**
+ * drm_kunit_helper_free_device - Frees a mock device
+ * @test: The test context object
+ * @dev: The device to free
+ *
+ * Frees a device allocated with drm_kunit_helper_alloc_device().
+ */
+void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
 {
-	struct device *dev = res->data;
-
 	root_device_unregister(dev);
 }
+EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
 
 /**
  * drm_kunit_helper_alloc_drm_device - Allocates a mock DRM device for KUnit tests
  * @test: The test context object
+ * @dev: The parent device object
  * @features: Mocked DRM device driver features
  *
- * This function allocates a new struct &device, creates a struct
- * &drm_driver and will create a struct &drm_device using both.
+ * This function creates a struct &drm_driver and will create a struct
+ * &drm_device from @dev and that driver.
  *
- * The device and driver are tied to the @test context and will get
- * cleaned at the end of the test. The drm_device is allocated through
+ * @dev should be allocated using drm_kunit_helper_alloc_device().
+ *
+ * The driver is tied to the @test context and will get cleaned at the
+ * end of the test. The drm_device is allocated through
  * devm_drm_dev_alloc() and will thus be freed through a device-managed
  * resource.
  *
@@ -54,19 +69,14 @@ static void dev_free(struct kunit_resource *res)
  * A pointer to the new drm_device, or an ERR_PTR() otherwise.
  */
 struct drm_device *
-drm_kunit_helper_alloc_drm_device(struct kunit *test,
+drm_kunit_helper_alloc_drm_device(struct kunit *test, struct device *dev,
 				  u32 features)
 {
 	struct kunit_dev *kdev;
 	struct drm_device *drm;
 	struct drm_driver *driver;
-	struct device *dev;
 	int ret;
 
-	dev = kunit_alloc_resource(test, dev_init, dev_free, GFP_KERNEL, KUNIT_DEVICE_NAME);
-	if (!dev)
-		return ERR_PTR(-ENOMEM);
-
 	driver = kunit_kzalloc(test, sizeof(*driver), GFP_KERNEL);
 	if (!driver)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/tests/drm_modes_test.c b/drivers/gpu/drm/tests/drm_modes_test.c
index 35965ad86188..d1e9f3c0433a 100644
--- a/drivers/gpu/drm/tests/drm_modes_test.c
+++ b/drivers/gpu/drm/tests/drm_modes_test.c
@@ -13,6 +13,7 @@
 
 struct drm_test_modes_priv {
 	struct drm_device *drm;
+	struct device *dev;
 };
 
 static int drm_test_modes_init(struct kunit *test)
@@ -22,7 +23,11 @@ static int drm_test_modes_init(struct kunit *test)
 	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
 
-	priv->drm = drm_kunit_helper_alloc_drm_device(test, DRIVER_MODESET);
+	priv->dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	priv->drm = drm_kunit_helper_alloc_drm_device(test, priv->dev,
+						      DRIVER_MODESET);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
 
 	test->priv = priv;
@@ -30,6 +35,13 @@ static int drm_test_modes_init(struct kunit *test)
 	return 0;
 }
 
+static void drm_test_modes_exit(struct kunit *test)
+{
+	struct drm_test_modes_priv *priv = test->priv;
+
+	drm_kunit_helper_free_device(test, priv->dev);
+}
+
 static void drm_test_modes_analog_tv_ntsc_480i(struct kunit *test)
 {
 	struct drm_test_modes_priv *priv = test->priv;
@@ -135,6 +147,7 @@ static struct kunit_case drm_modes_analog_tv_tests[] = {
 static struct kunit_suite drm_modes_analog_tv_test_suite = {
 	.name = "drm_modes_analog_tv",
 	.init = drm_test_modes_init,
+	.exit = drm_test_modes_exit,
 	.test_cases = drm_modes_analog_tv_tests,
 };
 
diff --git a/drivers/gpu/drm/tests/drm_probe_helper_test.c b/drivers/gpu/drm/tests/drm_probe_helper_test.c
index be61a92b79d2..63a3bd1a6e4d 100644
--- a/drivers/gpu/drm/tests/drm_probe_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_probe_helper_test.c
@@ -17,6 +17,7 @@
 
 struct drm_probe_helper_test_priv {
 	struct drm_device *drm;
+	struct device *dev;
 	struct drm_connector connector;
 };
 
@@ -39,7 +40,10 @@ static int drm_probe_helper_test_init(struct kunit *test)
 	KUNIT_ASSERT_NOT_NULL(test, priv);
 	test->priv = priv;
 
-	priv->drm = drm_kunit_helper_alloc_drm_device(test,
+	priv->dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	priv->drm = drm_kunit_helper_alloc_drm_device(test, priv->dev,
 						      DRIVER_MODESET | DRIVER_ATOMIC);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
 
@@ -55,6 +59,13 @@ static int drm_probe_helper_test_init(struct kunit *test)
 	return 0;
 }
 
+static void drm_probe_helper_test_exit(struct kunit *test)
+{
+	struct drm_probe_helper_test_priv *priv = test->priv;
+
+	drm_kunit_helper_free_device(test, priv->dev);
+}
+
 typedef struct drm_display_mode *(*expected_mode_func_t)(struct drm_device *);
 
 struct drm_connector_helper_tv_get_modes_test {
@@ -195,6 +206,7 @@ static struct kunit_case drm_test_connector_helper_tv_get_modes_tests[] = {
 static struct kunit_suite drm_test_connector_helper_tv_get_modes_suite = {
 	.name = "drm_connector_helper_tv_get_modes",
 	.init = drm_probe_helper_test_init,
+	.exit = drm_probe_helper_test_exit,
 	.test_cases = drm_test_connector_helper_tv_get_modes_tests,
 };
 
diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
index 6c12b1426ba0..b4277fe92c38 100644
--- a/include/drm/drm_kunit_helpers.h
+++ b/include/drm/drm_kunit_helpers.h
@@ -6,8 +6,11 @@
 struct drm_device;
 struct kunit;
 
+struct device *drm_kunit_helper_alloc_device(struct kunit *test);
+void drm_kunit_helper_free_device(struct kunit *test, struct device *dev);
+
 struct drm_device *
-drm_kunit_helper_alloc_drm_device(struct kunit *test,
+drm_kunit_helper_alloc_drm_device(struct kunit *test, struct device *dev,
 				  u32 features);
 
 #endif // DRM_KUNIT_HELPERS_H_
