diff --git a/sound/pci/mixart/mixart.c b/sound/pci/mixart/mixart.c
index f23a73577c2219cb7da2b03317bf1106b7e1f981..bb162507fe6c7b20166198fbcf6afd7d9baac042 100644
--- a/sound/pci/mixart/mixart.c
+++ b/sound/pci/mixart/mixart.c
@@ -607,6 +607,7 @@ static int snd_mixart_hw_params(struct snd_pcm_substream *subs,
 	/* set the format to the board */
 	err = mixart_set_format(stream, format);
 	if(err < 0) {
+		mutex_unlock(&mgr->setup_mutex);
 		return err;
 	}