diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 12fe926e32b4..742055908656 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1842,7 +1842,7 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 				 struct list_head *add_list,
 				 resource_size_t new_size)
 {
-	struct pci_dev_resource *dev_res;
+	resource_size_t add_size;
 
 	if (res->parent)
 		return;
@@ -1850,17 +1850,10 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 	if (resource_size(res) >= new_size)
 		return;
 
-	dev_res = res_to_dev_res(add_list, res);
-	if (!dev_res)
-		return;
-
-	/* Is there room to extend the window? */
-	if (new_size - resource_size(res) <= dev_res->add_size)
-		return;
-
-	dev_res->add_size = new_size - resource_size(res);
-	pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
-		&dev_res->add_size);
+	add_size = new_size - resource_size(res);
+	pci_dbg(bridge, "bridge window %pR extended by %pa\n", res, &add_size);
+	res->end = res->start + new_size - 1;
+	remove_from_list(add_list, res);
 }
 
 static void pci_bus_distribute_available_resources(struct pci_bus *bus,
@@ -1896,10 +1889,8 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
 			mmio_pref.end + 1);
 
 	/*
-	 * Update additional resource list (add_list) to fill all the
-	 * extra resource space available for this port except the space
-	 * calculated in __pci_bus_size_bridges() which covers all the
-	 * devices currently connected to the port and below.
+	 * Now that we have adjusted for alignment, update the bridge window
+	 * resources to fill as much remaining resource space as possible.
 	 */
 	adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
 	adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));