PCI: generic: Request host bridge window resources with core function

Use devm_request_pci_bus_resources() to request host bridge window
resources instead of doing it by hand in the driver.

No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pci-host-common.c

@@ -36,12 +36,15 @@ static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
 	if (err)
 		return err;
 
+	err = devm_request_pci_bus_resources(dev, resources);
+	if (err)
+		goto out_release_res;
+
 	resource_list_for_each_entry(win, resources) {
-		struct resource *parent, *res = win->res;
+		struct resource *res = win->res;
 
 		switch (resource_type(res)) {
 		case IORESOURCE_IO:
-			parent = &ioport_resource;
 			err = pci_remap_iospace(res, iobase);
 			if (err) {
 				dev_warn(dev, "error %d: failed to map resource %pR\n",
@@ -50,7 +53,6 @@ static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
 			}
 			break;
 		case IORESOURCE_MEM:
-			parent = &iomem_resource;
 			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
 			break;
 		case IORESOURCE_BUS:
@@ -58,10 +60,6 @@ static int gen_pci_parse_request_of_pci_ranges(struct device *dev,
 		default:
 			continue;
 		}
-
-		err = devm_request_resource(dev, parent, res);
-		if (err)
-			goto out_release_res;
 	}
 
 	if (!res_valid) {