static int __init riocm_init()

in rio_cm.c [2295:2358]

• 47 lines of code
• 7 McCabe index (conditional complexity)

static int __init riocm_init(void)
{
	int ret;

	/* Create device class needed by udev */
	dev_class = class_create(THIS_MODULE, DRV_NAME);
	if (IS_ERR(dev_class)) {
		riocm_error("Cannot create " DRV_NAME " class");
		return PTR_ERR(dev_class);
	}

	ret = alloc_chrdev_region(&dev_number, 0, 1, DRV_NAME);
	if (ret) {
		class_destroy(dev_class);
		return ret;
	}

	dev_major = MAJOR(dev_number);
	dev_minor_base = MINOR(dev_number);
	riocm_debug(INIT, "Registered class with %d major", dev_major);

	/*
	 * Register as rapidio_port class interface to get notifications about
	 * mport additions and removals.
	 */
	ret = class_interface_register(&rio_mport_interface);
	if (ret) {
		riocm_error("class_interface_register error: %d", ret);
		goto err_reg;
	}

	/*
	 * Register as RapidIO bus interface to get notifications about
	 * addition/removal of remote RapidIO devices.
	 */
	ret = subsys_interface_register(&riocm_interface);
	if (ret) {
		riocm_error("subsys_interface_register error: %d", ret);
		goto err_cl;
	}

	ret = register_reboot_notifier(&rio_cm_notifier);
	if (ret) {
		riocm_error("failed to register reboot notifier (err=%d)", ret);
		goto err_sif;
	}

	ret = riocm_cdev_add(dev_number);
	if (ret) {
		unregister_reboot_notifier(&rio_cm_notifier);
		ret = -ENODEV;
		goto err_sif;
	}

	return 0;
err_sif:
	subsys_interface_unregister(&riocm_interface);
err_cl:
	class_interface_unregister(&rio_mport_interface);
err_reg:
	unregister_chrdev_region(dev_number, 1);
	class_destroy(dev_class);
	return ret;
}