diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 0aca39762ed0ec981fb4f612741010a255a97587..bb1261591a1f300e17f8cb27e36071e5b3fb28a8 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -2595,6 +2595,8 @@ int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
 	};
 	int err;
 
+	if (WARN_ON(pcm->streams[stream].chmap_kctl))
+		return -EBUSY;
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;