// SPDX-License-Identifier: GPL-2.0// Copyright 2023 Maxime Ripard <mripard@kernel.org> #include <kunit/resource.h> #include <linux/device.h> #define DEVICE_NAME "test" struct test_priv {	bool probe_done;	bool release_done;	wait_queue_head_t release_wq;	struct device *dev;}; static int root_device_devm_init(struct kunit *test){	struct test_priv *priv; 	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);	init_waitqueue_head(&priv->release_wq); 	test->priv = priv; 	return 0;} static void devm_device_action(void *ptr){	struct test_priv *priv = ptr; 	priv->release_done = true;	wake_up_interruptible(&priv->release_wq);} #define RELEASE_TIMEOUT_MS	100 /* * Tests that a bus-less, non-probed device will run its device-managed * actions when unregistered. */static void root_device_devm_register_unregister_test(struct kunit *test){	struct test_priv *priv = test->priv;	int ret; 	priv->dev = root_device_register(DEVICE_NAME);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev); 	ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);	KUNIT_ASSERT_EQ(test, ret, 0); 	root_device_unregister(priv->dev); 	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));	KUNIT_EXPECT_GT(test, ret, 0);} static void devm_put_device_action(void *ptr){	struct test_priv *priv = ptr; 	put_device(priv->dev);	priv->release_done = true;	wake_up_interruptible(&priv->release_wq);} /* * Tests that a bus-less, non-probed device will run its device-managed * actions when unregistered, even if someone still holds a reference to * it. */static void root_device_devm_register_get_unregister_with_devm_test(struct kunit *test){	struct test_priv *priv = test->priv;	int ret; 	priv->dev = root_device_register(DEVICE_NAME);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev); 	get_device(priv->dev); 	ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);	KUNIT_ASSERT_EQ(test, ret, 0); 	root_device_unregister(priv->dev); 	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));	KUNIT_EXPECT_GT(test, ret, 0);} static struct kunit_case root_device_devm_tests[] = {	KUNIT_CASE(root_device_devm_register_unregister_test),	KUNIT_CASE(root_device_devm_register_get_unregister_with_devm_test),	{}}; static struct kunit_suite root_device_devm_test_suite = {	.name = "root-device-devm",	.init = root_device_devm_init,	.test_cases = root_device_devm_tests,}; kunit_test_suite(root_device_devm_test_suite); MODULE_DESCRIPTION("Test module for root devices");MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");MODULE_LICENSE("GPL");