ASoC: soc_bind_dai_link() directly returns success for a bound DAI link

This function will return success immediately for a bound DAI link.
No need to look for the cpu/codec DAIs again.
Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -960,6 +960,19 @@ static struct snd_soc_dai *snd_soc_find_dai(
 	return NULL;
 }
 
+static bool soc_is_dai_link_bound(struct snd_soc_card *card,
+		struct snd_soc_dai_link *dai_link)
+{
+	struct snd_soc_pcm_runtime *rtd;
+
+	list_for_each_entry(rtd, &card->rtd_list, list) {
+		if (rtd->dai_link == dai_link)
+			return true;
+	}
+
+	return false;
+}
+
 static int soc_bind_dai_link(struct snd_soc_card *card,
 	struct snd_soc_dai_link *dai_link)
 {
@@ -977,6 +990,12 @@ static int soc_bind_dai_link(struct snd_soc_card *card,
 	if (!rtd)
 		return -ENOMEM;
 
+	if (soc_is_dai_link_bound(card, dai_link)) {
+		dev_dbg(card->dev, "ASoC: dai link %s already bound\n",
+			dai_link->name);
+		return 0;
+	}
+
 	cpu_dai_component.name = dai_link->cpu_name;
 	cpu_dai_component.of_node = dai_link->cpu_of_node;
 	cpu_dai_component.dai_name = dai_link->cpu_dai_name;