diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 522bae73640a..88694746dc11 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -413,6 +413,14 @@ static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
 	 * it is alloced *before* rtd.
 	 * see
 	 *	soc_new_pcm_runtime()
+	 *
+	 * We don't need to mind freeing for rtd,
+	 * because it was created from dev (= rtd->dev)
+	 * see
+	 *	soc_new_pcm_runtime()
+	 *
+	 *		rtd = devm_kzalloc(dev, ...);
+	 *		rtd->dev = dev
 	 */
 	device_unregister(rtd->dev);
 }