static int __init wdt_init()

in wdt.c [588:657]

• 59 lines of code
• 13 McCabe index (conditional complexity)

static int __init wdt_init(void)
{
	int ret;

	if (type != 500 && type != 501) {
		pr_err("unknown card type '%d'\n", type);
		return -ENODEV;
	}

	/* Check that the heartbeat value is within it's range;
	   if not reset to the default */
	if (wdt_set_heartbeat(heartbeat)) {
		wdt_set_heartbeat(WD_TIMO);
		pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
			WD_TIMO);
	}

	if (!request_region(io, 8, "wdt501p")) {
		pr_err("I/O address 0x%04x already in use\n", io);
		ret = -EBUSY;
		goto out;
	}

	ret = request_irq(irq, wdt_interrupt, 0, "wdt501p", NULL);
	if (ret) {
		pr_err("IRQ %d is not free\n", irq);
		goto outreg;
	}

	ret = register_reboot_notifier(&wdt_notifier);
	if (ret) {
		pr_err("cannot register reboot notifier (err=%d)\n", ret);
		goto outirq;
	}

	if (type == 501) {
		ret = misc_register(&temp_miscdev);
		if (ret) {
			pr_err("cannot register miscdev on minor=%d (err=%d)\n",
			       TEMP_MINOR, ret);
			goto outrbt;
		}
	}

	ret = misc_register(&wdt_miscdev);
	if (ret) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		goto outmisc;
	}

	pr_info("WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",
		io, irq, heartbeat, nowayout);
	if (type == 501)
		pr_info("Fan Tachometer is %s\n",
			tachometer ? "Enabled" : "Disabled");
	return 0;

outmisc:
	if (type == 501)
		misc_deregister(&temp_miscdev);
outrbt:
	unregister_reboot_notifier(&wdt_notifier);
outirq:
	free_irq(irq, NULL);
outreg:
	release_region(io, 8);
out:
	return ret;
}