diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
index f33ba58b753c..71dad104ff8a 100644
--- a/sound/hda/ext/hdac_ext_bus.c
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -93,7 +93,6 @@ int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 			const struct hdac_ext_bus_ops *ext_ops)
 {
 	int ret;
-	static int idx;
 
 	/* check if io ops are provided, if not load the defaults */
 	if (io_ops == NULL)
@@ -104,7 +103,12 @@ int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 		return ret;
 
 	bus->ext_ops = ext_ops;
-	bus->idx = idx++;
+	/* FIXME:
+	 * Currently only one bus is supported, if there is device with more
+	 * buses, bus->idx should be greater than 0, but there needs to be a
+	 * reliable way to always assign same number.
+	 */
+	bus->idx = 0;
 	bus->cmd_dma_state = true;
 
 	return 0;