diff --git a/include/sound/soc.h b/include/sound/soc.h
index 2ebf7877c148..70de2f82e872 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -288,6 +288,11 @@ enum snd_soc_pcm_subclass {
 	SND_SOC_PCM_CLASS_BE	= 1,
 };
 
+enum snd_soc_card_subclass {
+	SND_SOC_CARD_CLASS_INIT	= 0,
+	SND_SOC_CARD_CLASS_PCM	= 1,
+};
+
 int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id,
 			     int source, unsigned int freq, int dir);
 int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index a4deebc0801a..a6da20a72d43 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1416,7 +1416,7 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
 	struct snd_soc_dai_link *dai_link;
 	int ret, i, order;
 
-	mutex_lock(&card->mutex);
+	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
 
 	if (card->instantiated) {
 		mutex_unlock(&card->mutex);