static int wdtpci_init_one()

in wdt_pci.c [604:701]

• 81 lines of code
• 16 McCabe index (conditional complexity)

static int wdtpci_init_one(struct pci_dev *dev,
					const struct pci_device_id *ent)
{
	int ret = -EIO;

	dev_count++;
	if (dev_count > 1) {
		pr_err("This driver only supports one device\n");
		return -ENODEV;
	}

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

	if (pci_enable_device(dev)) {
		pr_err("Not possible to enable PCI Device\n");
		return -ENODEV;
	}

	if (pci_resource_start(dev, 2) == 0x0000) {
		pr_err("No I/O-Address for card detected\n");
		ret = -ENODEV;
		goto out_pci;
	}

	if (pci_request_region(dev, 2, "wdt_pci")) {
		pr_err("I/O address 0x%llx already in use\n",
		       (unsigned long long)pci_resource_start(dev, 2));
		goto out_pci;
	}

	irq = dev->irq;
	io = pci_resource_start(dev, 2);

	if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
			 "wdt_pci", &wdtpci_miscdev)) {
		pr_err("IRQ %d is not free\n", irq);
		goto out_reg;
	}

	pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
		(unsigned long long)io, irq);

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

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

	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 out_rbt;
		}
	}

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

	pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
		heartbeat, nowayout);
	if (type == 501)
		pr_info("Fan Tachometer is %s\n",
			tachometer ? "Enabled" : "Disabled");

	ret = 0;
out:
	return ret;

out_misc:
	if (type == 501)
		misc_deregister(&temp_miscdev);
out_rbt:
	unregister_reboot_notifier(&wdtpci_notifier);
out_irq:
	free_irq(irq, &wdtpci_miscdev);
out_reg:
	pci_release_region(dev, 2);
out_pci:
	pci_disable_device(dev);
	goto out;
}