static int pci_mmap_resource()

in kernel/pci-sysfs.c [66:93]

• 23 lines of code
• 9 McCabe index (conditional complexity)

static int pci_mmap_resource(struct kobject *kobj,
			     struct bin_attribute *attr,
			     struct vm_area_struct *vma, int sparse)
{
	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
	struct resource *res = attr->private;
	enum pci_mmap_state mmap_type;
	struct pci_bus_region bar;
	int i;

	for (i = 0; i < PCI_STD_NUM_BARS; i++)
		if (res == &pdev->resource[i])
			break;
	if (i >= PCI_STD_NUM_BARS)
		return -ENODEV;

	if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
		return -EINVAL;

	if (!__pci_mmap_fits(pdev, i, vma, sparse))
		return -EINVAL;

	pcibios_resource_to_bus(pdev->bus, &bar, res);
	vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

	return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
}