microblaze/PCI: convert to pci_create_root_bus() for correct root bus resources

Convert from pci_create_bus() to pci_create_root_bus().  This way the root
bus resources are correct immediately.  This patch doesn't fix a problem
because microblaze fixed the resources before scanning the bus, but it makes
microblaze more consistent with other architectures.  It also allows us to
use the pci_scan_root_bus() path safely.

CC: Michal Simek <monstr@monstr.eu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/microblaze/pci/pci-common.c

@@ -1513,14 +1513,18 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 	return pci_enable_resources(dev, mask);
 }
 
-static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
+static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose, struct list_head *resources)
 {
-	struct pci_bus *bus = hose->bus;
 	struct resource *res;
 	int i;
 
 	/* Hookup PHB IO resource */
-	bus->resource[0] = res = &hose->io_resource;
+	res = &hose->io_resource;
+
+	/* Fixup IO space offset */
+	io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
+	res->start = (res->start + io_offset) & 0xffffffffu;
+	res->end = (res->end + io_offset) & 0xffffffffu;
 
 	if (!res->flags) {
 		printk(KERN_WARNING "PCI: I/O resource not set for host"
@@ -1531,6 +1535,7 @@ static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
 		res->end = res->start + IO_SPACE_LIMIT;
 		res->flags = IORESOURCE_IO;
 	}
+	pci_add_resource(resources, res);
 
 	pr_debug("PCI: PHB IO resource    = %016llx-%016llx [%lx]\n",
 		 (unsigned long long)res->start,
@@ -1553,7 +1558,7 @@ static void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
 			res->flags = IORESOURCE_MEM;
 
 		}
-		bus->resource[i+1] = res;
+		pci_add_resource(resources, res);
 
 		pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n",
 			i, (unsigned long long)res->start,
@@ -1576,32 +1581,27 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 
 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
 {
+	LIST_HEAD(resources);
 	struct pci_bus *bus;
 	struct device_node *node = hose->dn;
-	unsigned long io_offset;
-	struct resource *res = &hose->io_resource;
 
 	pr_debug("PCI: Scanning PHB %s\n",
 		 node ? node->full_name : "<NO NAME>");
 
+	pcibios_setup_phb_resources(hose, &resources);
+
 	/* Create an empty bus for the toplevel */
-	bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
+	bus = pci_create_root_bus(hose->parent, hose->first_busno, hose->ops,
+				  hose, &resources);
 	if (bus == NULL) {
 		printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
 		       hose->global_number);
+		pci_free_resource_list(&resources);
 		return;
 	}
 	bus->secondary = hose->first_busno;
 	hose->bus = bus;
 
-	/* Fixup IO space offset */
-	io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
-	res->start = (res->start + io_offset) & 0xffffffffu;
-	res->end = (res->end + io_offset) & 0xffffffffu;
-
-	/* Wire up PHB bus resources */
-	pcibios_setup_phb_resources(hose);
-
 	/* Scan children */
 	hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
 }