static void pcibios_scanbus()

in drivers/pci/pci.c [31:87]

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

static void pcibios_scanbus(struct pci_channel *hose)
{
	static int next_busno;
	static int need_domain_info;
	LIST_HEAD(resources);
	struct resource *res;
	resource_size_t offset;
	int i, ret;
	struct pci_host_bridge *bridge;

	bridge = pci_alloc_host_bridge(0);
	if (!bridge)
		return;

	for (i = 0; i < hose->nr_resources; i++) {
		res = hose->resources + i;
		offset = 0;
		if (res->flags & IORESOURCE_DISABLED)
			continue;
		if (res->flags & IORESOURCE_IO)
			offset = hose->io_offset;
		else if (res->flags & IORESOURCE_MEM)
			offset = hose->mem_offset;
		pci_add_resource_offset(&resources, res, offset);
	}

	list_splice_init(&resources, &bridge->windows);
	bridge->dev.parent = NULL;
	bridge->sysdata = hose;
	bridge->busnr = next_busno;
	bridge->ops = hose->pci_ops;
	bridge->swizzle_irq = pci_common_swizzle;
	bridge->map_irq = pcibios_map_platform_irq;

	ret = pci_scan_root_bus_bridge(bridge);
	if (ret) {
		pci_free_host_bridge(bridge);
		return;
	}

	hose->bus = bridge->bus;

	need_domain_info = need_domain_info || hose->index;
	hose->need_domain_info = need_domain_info;

	next_busno = hose->bus->busn_res.end + 1;
	/* Don't allow 8-bit bus number overflow inside the hose -
	   reserve some space for bridges. */
	if (next_busno > 224) {
		next_busno = 0;
		need_domain_info = 1;
	}

	pci_bus_size_bridges(hose->bus);
	pci_bus_assign_resources(hose->bus);
	pci_bus_add_devices(hose->bus);
}