diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 729fc764..e9c723e 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -771,6 +771,7 @@
 	struct hda_cache_rec cmd_cache;	/* cache for other commands */
 
 	struct mutex spdif_mutex;
+	struct mutex control_mutex;
 	unsigned int spdif_status;	/* IEC958 status bits */
 	unsigned short spdif_ctls;	/* SPDIF control bits */
 	unsigned int spdif_in_enable;	/* SPDIF input enable? */