diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index d76674ec712c..85439adb747a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1840,14 +1840,14 @@ void __init pci_assign_unassigned_resources(void)
 
 static void extend_bridge_window(struct pci_dev *bridge, struct resource *res,
 				 struct list_head *add_list,
-				 resource_size_t available)
+				 resource_size_t new_size)
 {
 	struct pci_dev_resource *dev_res;
 
 	if (res->parent)
 		return;
 
-	if (resource_size(res) >= available)
+	if (resource_size(res) >= new_size)
 		return;
 
 	dev_res = res_to_dev_res(add_list, res);
@@ -1855,10 +1855,10 @@ static void extend_bridge_window(struct pci_dev *bridge, struct resource *res,
 		return;
 
 	/* Is there room to extend the window? */
-	if (available - resource_size(res) <= dev_res->add_size)
+	if (new_size - resource_size(res) <= dev_res->add_size)
 		return;
 
-	dev_res->add_size = available - resource_size(res);
+	dev_res->add_size = new_size - resource_size(res);
 	pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
 		&dev_res->add_size);
 }