diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 6e443135..7eed671 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -343,9 +343,15 @@
 				(!(r->flags & IORESOURCE_ROM_ENABLE)))
 			continue;
 
+		if (r->flags & IORESOURCE_UNSET) {
+			dev_err(&dev->dev, "can't enable device: BAR %d %pR not assigned\n",
+				i, r);
+			return -EINVAL;
+		}
+
 		if (!r->parent) {
-			dev_err(&dev->dev, "device not available "
-				"(can't reserve %pR)\n", r);
+			dev_err(&dev->dev, "can't enable device: BAR %d %pR not claimed\n",
+				i, r);
 			return -EINVAL;
 		}