ASoC: simple-card-utils: fixup dlc->xxx handling for error case

Current graph_util_parse_dai() has 2 issue for dlc->xxx handling.

1) dlc->xxx might be filled if snd_soc_get_dai_via_args() (A) works.
   In such case it will fill dlc->xxx first (B), and detect error
   after that (C). We need to fill dlc->xxx in success case only.

(A)	dai = snd_soc_get_dai_via_args(&args);
	if (dai) {
		ret = -ENOMEM;
 ^		dlc->of_node  = ...
(B)		dlc->dai_name = ...
 v		dlc->dai_args = ...
(C)		if (!dlc->dai_args)
			goto end;
		...
	}

2) graph_util_parse_dai() itself has 2 patterns (X)(Y) to fill dlc->xxx.
   Both case, we need to call of_node_put(node) (Z) in error case, but we
   are calling it only in (Y) case.

	int graph_util_parse_dai(...)
	{
		...
		dai = snd_soc_get_dai_via_args(&args);
		if (dai) {
			...
 ^			dlc->of_node  = ...
(X)			dlc->dai_name = ...
 v			dlc->dai_args = ...
			...
		}
		...
(Y)		ret = snd_soc_get_dlc(&args, dlc);
		if (ret < 0) {
(Z)			of_node_put(node);
			...
		}
		...
	}

This patch fixup both case. Make it easy to understand, update
lavel "end" to "err", too.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87fribr2ns.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 14 insertions, 9 deletions

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index a1ccc300e68c..a26487dca764 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -1119,12 +1119,16 @@ int graph_util_parse_dai(struct simple_util_priv *priv, struct device_node *ep,
 	args.np = ep;
 	dai = snd_soc_get_dai_via_args(&args);
 	if (dai) {
+		const char *dai_name = snd_soc_dai_name_get(dai);
+		const struct of_phandle_args *dai_args = snd_soc_copy_dai_args(dev, &args);
+
 		ret = -ENOMEM;
+		if (!dai_args)
+			goto err;
+
 		dlc->of_node  = node;
-		dlc->dai_name = snd_soc_dai_name_get(dai);
-		dlc->dai_args = snd_soc_copy_dai_args(dev, &args);
-		if (!dlc->dai_args)
-			goto end;
+		dlc->dai_name = dai_name;
+		dlc->dai_args = dai_args;
 
 		goto parse_dai_end;
 	}
@@ -1154,16 +1158,17 @@ int graph_util_parse_dai(struct simple_util_priv *priv, struct device_node *ep,
 	 *    if he unbinded CPU or Codec.
 	 */
 	ret = snd_soc_get_dlc(&args, dlc);
-	if (ret < 0) {
-		of_node_put(node);
-		goto end;
-	}
+	if (ret < 0)
+		goto err;
 
 parse_dai_end:
 	if (is_single_link)
 		*is_single_link = of_graph_get_endpoint_count(node) == 1;
 	ret = 0;
-end:
+err:
+	if (ret < 0)
+		of_node_put(node);
+
 	return simple_ret(priv, ret);
 }
 EXPORT_SYMBOL_GPL(graph_util_parse_dai);