diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 85844d8c3efd5e5be16ce4842cf58e5c0d84016c..2e99a500cb83fe48ac065333fad036186935aa4f 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -72,8 +72,13 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
 
 	/* Start looking for a phandle to an MSI controller. */
 	np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
+
+	/*
+	 * If we don't have an msi-parent property, look for a domain
+	 * directly attached to the host bridge.
+	 */
 	if (!np)
-		return NULL;
+		np = bus->dev.of_node;
 
 	d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
 	if (d)