diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 57570ac..e6ce262 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -39,20 +39,26 @@
 			   int size)
 {
 	int len;
+	int count;
 
-	if (!acpi_dev->flags.hardware_id)
+	if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
 		return -ENODEV;
 
-	len = snprintf(modalias, size, "acpi:%s:",
-		       acpi_dev->pnp.hardware_id);
-	if (len < 0 || len >= size)
-		return -EINVAL;
+	len = snprintf(modalias, size, "acpi:");
 	size -= len;
 
+	if (acpi_dev->flags.hardware_id) {
+		count = snprintf(&modalias[len], size, "%s:",
+				 acpi_dev->pnp.hardware_id);
+		if (count < 0 || count >= size)
+			return -EINVAL;
+		len += count;
+		size -= count;
+	}
+
 	if (acpi_dev->flags.compatible_ids) {
 		struct acpi_compatible_id_list *cid_list;
 		int i;
-		int count;
 
 		cid_list = acpi_dev->pnp.cid_list;
 		for (i = 0; i < cid_list->count; i++) {