static int probe()

in uio_pci_generic.c [71:137]
57 lines of code
11 McCabe index (conditional complexity)

static int probe(struct pci_dev *pdev,
			   const struct pci_device_id *id)
{
	struct uio_pci_generic_dev *gdev;
	struct uio_mem *uiomem;
	int err;
	int i;

	err = pcim_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n",
			__func__, err);
		return err;
	}

	if (pdev->irq && !pci_intx_mask_supported(pdev))
		return -ENODEV;

	gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
	if (!gdev)
		return -ENOMEM;

	gdev->info.name = "uio_pci_generic";
	gdev->info.version = DRIVER_VERSION;
	gdev->info.release = release;
	gdev->pdev = pdev;
	if (pdev->irq && (pdev->irq != IRQ_NOTCONNECTED)) {
		gdev->info.irq = pdev->irq;
		gdev->info.irq_flags = IRQF_SHARED;
		gdev->info.handler = irqhandler;
	} else {
		dev_warn(&pdev->dev, "No IRQ assigned to device: "
			 "no support for interrupts?\n");
	}

	uiomem = &gdev->info.mem[0];
	for (i = 0; i < MAX_UIO_MAPS; ++i) {
		struct resource *r = &pdev->resource[i];

		if (r->flags != (IORESOURCE_SIZEALIGN | IORESOURCE_MEM))
			continue;

		if (uiomem >= &gdev->info.mem[MAX_UIO_MAPS]) {
			dev_warn(
				&pdev->dev,
				"device has more than " __stringify(
					MAX_UIO_MAPS) " I/O memory resources.\n");
			break;
		}

		uiomem->memtype = UIO_MEM_PHYS;
		uiomem->addr = r->start & PAGE_MASK;
		uiomem->offs = r->start & ~PAGE_MASK;
		uiomem->size =
			(uiomem->offs + resource_size(r) + PAGE_SIZE - 1) &
			PAGE_MASK;
		uiomem->name = r->name;
		++uiomem;
	}

	while (uiomem < &gdev->info.mem[MAX_UIO_MAPS]) {
		uiomem->size = 0;
		++uiomem;
	}

	return devm_uio_register_device(&pdev->dev, &gdev->info);
}