[PATCH 1/2][RFC] ASoC: add for_each_link_codecs() macro

[Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>]

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

ALSA SoC snd_soc_dai_link has snd_soc_dai_link_component array
for codecs.
To be more readable code, this patch adds
new for_each_link_codecs() macro, and replace existing code to it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
 include/sound/soc.h        |  4 ++++
 sound/soc/meson/axg-card.c |  5 +++--
 sound/soc/soc-core.c       | 17 ++++++++---------
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 96c19aa..ce42c57 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -978,6 +978,10 @@ struct snd_soc_dai_link {
 	struct list_head list; /* DAI link list of the soc card */
 	struct snd_soc_dobj dobj; /* For topology */
 };
+#define for_each_link_codecs(link, i, codec)				\
+	for ((i) = 0;							\
+	     ((i) < link->num_codecs) && ((codec) = &link->codecs[i]);	\
+	     (i)++)
 
 struct snd_soc_codec_conf {
 	/*
diff --git a/sound/soc/meson/axg-card.c b/sound/soc/meson/axg-card.c
index b76a5f4..3e68f1a 100644
--- a/sound/soc/meson/axg-card.c
+++ b/sound/soc/meson/axg-card.c
@@ -97,14 +97,15 @@ static void axg_card_clean_references(struct axg_card *priv)
 {
 	struct snd_soc_card *card = &priv->card;
 	struct snd_soc_dai_link *link;
+	struct snd_soc_dai_link_component *codec;
 	int i, j;
 
 	if (card->dai_link) {
 		for (i = 0; i < card->num_links; i++) {
 			link = &card->dai_link[i];
 			of_node_put(link->cpu_of_node);
-			for (j = 0; j < link->num_codecs; j++)
-				of_node_put(link->codecs[j].of_node);
+			for_each_link_codecs(link, j, codec)
+				of_node_put(codec->of_node);
 		}
 	}
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 2a73630..5bc69a3 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1071,6 +1071,7 @@ static int soc_init_dai_link(struct snd_soc_card *card,
 				   struct snd_soc_dai_link *link)
 {
 	int i, ret;
+	struct snd_soc_dai_link_component *codec;
 
 	ret = snd_soc_init_platform(card, link);
 	if (ret) {
@@ -1084,19 +1085,19 @@ static int soc_init_dai_link(struct snd_soc_card *card,
 		return ret;
 	}
 
-	for (i = 0; i < link->num_codecs; i++) {
+	for_each_link_codecs(link, i, codec) {
 		/*
 		 * Codec must be specified by 1 of name or OF node,
 		 * not both or neither.
 		 */
-		if (!!link->codecs[i].name ==
-		    !!link->codecs[i].of_node) {
+		if (!!codec->name ==
+		    !!codec->of_node) {
 			dev_err(card->dev, "ASoC: Neither/both codec name/of_node are set for %s\n",
 				link->name);
 			return -EINVAL;
 		}
 		/* Codec DAI name must be specified */
-		if (!link->codecs[i].dai_name) {
+		if (!codec->dai_name) {
 			dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
 				link->name);
 			return -EINVAL;
@@ -3798,10 +3799,10 @@ EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name);
  */
 void snd_soc_of_put_dai_link_codecs(struct snd_soc_dai_link *dai_link)
 {
-	struct snd_soc_dai_link_component *component = dai_link->codecs;
+	struct snd_soc_dai_link_component *component;
 	int index;
 
-	for (index = 0; index < dai_link->num_codecs; index++, component++) {
+	for_each_link_codecs(dai_link, index, component) {
 		if (!component->of_node)
 			break;
 		of_node_put(component->of_node);
@@ -3853,9 +3854,7 @@ int snd_soc_of_get_dai_link_codecs(struct device *dev,
 	dai_link->num_codecs = num_codecs;
 
 	/* Parse the list */
-	for (index = 0, component = dai_link->codecs;
-	     index < dai_link->num_codecs;
-	     index++, component++) {
+	for_each_link_codecs(dai_link, index, component) {
 		ret = of_parse_phandle_with_args(of_node, name,
 						 "#sound-dai-cells",
 						  index, &args);
-- 
2.7.4