ASoC: soc-dai: add snd_soc_dai_hw_free()

Current ALSA SoC is directly using dai->driver->ops->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_hw_free() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87y30qhn4w.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -148,6 +148,8 @@ int snd_soc_dai_is_dummy(struct snd_soc_dai *dai);
 int snd_soc_dai_hw_params(struct snd_soc_dai *dai,
 			  struct snd_pcm_substream *substream,
 			  struct snd_pcm_hw_params *params);
+void snd_soc_dai_hw_free(struct snd_soc_dai *dai,
+			 struct snd_pcm_substream *substream);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-dai.c

@@ -282,3 +282,10 @@ int snd_soc_dai_hw_params(struct snd_soc_dai *dai,
 
 	return 0;
 }
+
+void snd_soc_dai_hw_free(struct snd_soc_dai *dai,
+			 struct snd_pcm_substream *substream)
+{
+	if (dai->driver->ops->hw_free)
+		dai->driver->ops->hw_free(substream, dai);
+}

sound/soc/soc-dapm.c

@@ -3898,9 +3898,7 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 		snd_soc_dapm_widget_for_each_source_path(w, path) {
 			source = path->source->priv;
 
-			if (source->driver->ops->hw_free)
-				source->driver->ops->hw_free(&substream,
-							     source);
+			snd_soc_dai_hw_free(source, &substream);
 
 			source->active--;
 			if (source->driver->ops->shutdown)
@@ -3912,8 +3910,7 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 		snd_soc_dapm_widget_for_each_sink_path(w, path) {
 			sink = path->sink->priv;
 
-			if (sink->driver->ops->hw_free)
-				sink->driver->ops->hw_free(&substream, sink);
+			snd_soc_dai_hw_free(sink, &substream);
 
 			sink->active--;
 			if (sink->driver->ops->shutdown)

sound/soc/soc-pcm.c

@@ -1011,8 +1011,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 component_err:
 	soc_pcm_components_hw_free(substream, component);
 
-	if (cpu_dai->driver->ops->hw_free)
-		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
+	snd_soc_dai_hw_free(cpu_dai, substream);
 	cpu_dai->rate = 0;
 
 interface_err:
@@ -1023,8 +1022,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 			continue;
 
-		if (codec_dai->driver->ops->hw_free)
-			codec_dai->driver->ops->hw_free(substream, codec_dai);
+		snd_soc_dai_hw_free(codec_dai, substream);
 		codec_dai->rate = 0;
 	}
 
@@ -1083,12 +1081,10 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 		if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
 			continue;
 
-		if (codec_dai->driver->ops->hw_free)
-			codec_dai->driver->ops->hw_free(substream, codec_dai);
+		snd_soc_dai_hw_free(codec_dai, substream);
 	}
 
-	if (cpu_dai->driver->ops->hw_free)
-		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
+	snd_soc_dai_hw_free(cpu_dai, substream);
 
 	mutex_unlock(&rtd->pcm_mutex);
 	return 0;