diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 86b69f85..84543f5 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -849,6 +849,10 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
 		break;
 
 	case PCI_CLASS_BRIDGE_PCI:
+		/* don't size subtractive decoding (transparent)
+		 * PCI-to-PCI bridges */
+		if (bus->self->transparent)
+			break;
 		pci_bridge_check_ranges(bus);
 		if (bus->self->is_hotplug_bridge) {
 			additional_io_size  = pci_hotplug_io_size;