static int __init bl_idle_init()

in cpuidle-big_little.c [162:228]

• 42 lines of code
• 10 McCabe index (conditional complexity)

static int __init bl_idle_init(void)
{
	int ret;
	struct device_node *root = of_find_node_by_path("/");
	const struct of_device_id *match_id;

	if (!root)
		return -ENODEV;

	/*
	 * Initialize the driver just for a compliant set of machines
	 */
	match_id = of_match_node(compatible_machine_match, root);

	of_node_put(root);

	if (!match_id)
		return -ENODEV;

	if (!mcpm_is_available())
		return -EUNATCH;

	/*
	 * For now the differentiation between little and big cores
	 * is based on the part number. A7 cores are considered little
	 * cores, A15 are considered big cores. This distinction may
	 * evolve in the future with a more generic matching approach.
	 */
	ret = bl_idle_driver_init(&bl_idle_little_driver,
				  ARM_CPU_PART_CORTEX_A7);
	if (ret)
		return ret;

	ret = bl_idle_driver_init(&bl_idle_big_driver, ARM_CPU_PART_CORTEX_A15);
	if (ret)
		goto out_uninit_little;

	/* Start at index 1, index 0 standard WFI */
	ret = dt_init_idle_driver(&bl_idle_big_driver, bl_idle_state_match, 1);
	if (ret < 0)
		goto out_uninit_big;

	/* Start at index 1, index 0 standard WFI */
	ret = dt_init_idle_driver(&bl_idle_little_driver,
				  bl_idle_state_match, 1);
	if (ret < 0)
		goto out_uninit_big;

	ret = cpuidle_register(&bl_idle_little_driver, NULL);
	if (ret)
		goto out_uninit_big;

	ret = cpuidle_register(&bl_idle_big_driver, NULL);
	if (ret)
		goto out_unregister_little;

	return 0;

out_unregister_little:
	cpuidle_unregister(&bl_idle_little_driver);
out_uninit_big:
	kfree(bl_idle_big_driver.cpumask);
out_uninit_little:
	kfree(bl_idle_little_driver.cpumask);

	return ret;
}