static int mf624_pci_probe()

in uio_mf624.c [135:193]

• 39 lines of code
• 8 McCabe index (conditional complexity)

static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct uio_info *info;

	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (pci_enable_device(dev))
		return -ENODEV;

	if (pci_request_regions(dev, "mf624"))
		goto out_disable;

	info->name = "mf624";
	info->version = "0.0.1";

	/* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */

	/* BAR0 */
	if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
			    "bits, special functions"))
		goto out_release;
	/* BAR2 */
	if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
		goto out_unmap0;

	/* BAR4 */
	if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
		goto out_unmap1;

	info->irq = dev->irq;
	info->irq_flags = IRQF_SHARED;
	info->handler = mf624_irq_handler;

	info->irqcontrol = mf624_irqcontrol;

	if (uio_register_device(&dev->dev, info))
		goto out_unmap2;

	pci_set_drvdata(dev, info);

	return 0;

out_unmap2:
	iounmap(info->mem[2].internal_addr);
out_unmap1:
	iounmap(info->mem[1].internal_addr);
out_unmap0:
	iounmap(info->mem[0].internal_addr);

out_release:
	pci_release_regions(dev);

out_disable:
	pci_disable_device(dev);

	return -ENODEV;
}