ASoC: soc-pcm: move dpcm_path_put() to soc-pcm.c

dpcm_path_put() (A) is calling kfree(*list).
The freed list is created by dapm_widget_list_create() (B) which is called
from snd_soc_dapm_dai_get_connected_widgets() (C) which is called from
dpcm_path_get() (D).

(B)	dapm_widget_list_create(**list, ...)
	{
		...
=>		*list = kzalloc();
		...
	}

(C)	snd_soc_dapm_dai_get_connected_widgets(..., **list, ...)
	{
		...
		dapm_widget_list_create(list, ...);
		...
	}

(D)	dpcm_path_get(..., **list)
	{
		...
		snd_soc_dapm_dai_get_connected_widgets(..., list, ...);
		...
	}

(A)	dpcm_path_put(**list)
	{
=>		kfree(*list);
	}

This kind of unbalance code is very difficult to read/understand.
To avoid this issue, this patch adds each missing paired function
dapm_widget_list_free()         for dapm_widget_list_create() (B), and
snd_soc_dapm_dai_free_widgets() for snd_soc_dapm_dai_get_connected_widgets() (C).

This patch uses these, and moves dpcm_path_put() next to dpcm_path_get().

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87a75fjc9q.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dapm.h

@@ -484,6 +484,7 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
 	struct snd_soc_dapm_widget_list **list,
 	bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
 				      enum snd_soc_dapm_direction));
+void snd_soc_dapm_dai_free_widgets(struct snd_soc_dapm_widget_list **list);
 
 struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
 	struct snd_kcontrol *kcontrol);

include/sound/soc-dpcm.h

@@ -145,6 +145,7 @@ static inline void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 
 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 	int stream, struct snd_soc_dapm_widget_list **list_);
+void dpcm_path_put(struct snd_soc_dapm_widget_list **list);
 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 	int stream, struct snd_soc_dapm_widget_list **list, int new);
 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream);
@@ -158,10 +159,4 @@ int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream);
 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 	int event);
 
-static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
-{
-	kfree(*list);
-}
-
-
 #endif

sound/soc/soc-dapm.c

@@ -1105,6 +1105,11 @@ static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
 	}
 }
 
+static void dapm_widget_list_free(struct snd_soc_dapm_widget_list **list)
+{
+	kfree(*list);
+}
+
 static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
 	struct list_head *widgets)
 {
@@ -1310,6 +1315,11 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
 	return paths;
 }
 
+void snd_soc_dapm_dai_free_widgets(struct snd_soc_dapm_widget_list **list)
+{
+	dapm_widget_list_free(list);
+}
+
 /*
  * Handler for regulator supply widget.
  */

sound/soc/soc-pcm.c

@@ -1302,6 +1302,11 @@ int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 	return paths;
 }
 
+void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
+{
+	snd_soc_dapm_dai_free_widgets(list);
+}
+
 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
 	struct snd_soc_dapm_widget_list **list_)
 {