diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index 9f67244d4946..542fc35ec9b7 100644
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -475,7 +475,8 @@ static void had_build_channel_allocation_map(struct snd_intelhad *intelhaddata)
 	kfree(intelhaddata->chmap->chmap);
 	intelhaddata->chmap->chmap = NULL;
 
-	chmap = kzalloc_obj(*chmap);
+	/* info->chmap must be zero-terminated; allocate a spare terminator entry */
+	chmap = kzalloc_objs(*chmap, 2);
 	if (!chmap)
 		return;
 
@@ -575,6 +576,12 @@ static int had_register_chmap_ctls(struct snd_intelhad *intelhaddata,
 	intelhaddata->chmap->kctl->info = had_chmap_ctl_info;
 	intelhaddata->chmap->kctl->get = had_chmap_ctl_get;
 	intelhaddata->chmap->chmap = NULL;
+
+	/* drop the inherited TLV read: it walks chmap without our mutex */
+	intelhaddata->chmap->kctl->tlv.c = NULL;
+	intelhaddata->chmap->kctl->vd[0].access &=
+		~(SNDRV_CTL_ELEM_ACCESS_TLV_READ | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
+
 	return 0;
 }