diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index f174685a7f3b..80d368530fbb 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -146,7 +146,9 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
 				err = -ENXIO;
 				goto _error;
 			}
+			mutex_lock(&pcm->open_mutex);
 			err = snd_pcm_info_user(substream, info);
+			mutex_unlock(&pcm->open_mutex);
 		_error:
 			mutex_unlock(&register_mutex);
 			return err;