[PATCH 09/14] ASoC: soc-pcm: indicate error message at dpcm_fe/be_dai_hw_params()

[Kuninori Morimoto]

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

Indicating error message when failed case is very useful for debuging.
In many case, its style is like below.

	int function(...)
	{
		...
		return ret;
	}

	int caller(...)
	{
		...
		ret = function(...);
		if (ret < 0)
			dev_err(...)
		...
	}

This is not so bad, but in this style *each caller* needs to indicate
duplicate same error message, and some caller is forgetting to do it.
And caller can't indicate detail function() error information.

If function() indicates error message, we can get same and
detail information without forgot.

	int function(...)
	{
		...
		if (ret < 0)
			dev_err(...)

		return ret;
	}

	int caller(...)
	{
		...
		ret = function(...);
		...
	}

This patch follow above style at dpcm_fe/be_dai_hw_params()

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
 sound/soc/soc-pcm.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 9e3ecf788a74..e141d0658279 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1882,14 +1882,14 @@ static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
 
 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
 {
+	struct snd_soc_pcm_runtime *be;
+	struct snd_pcm_substream *be_substream;
 	struct snd_soc_dpcm *dpcm;
 	int ret;
 
 	for_each_dpcm_be(fe, stream, dpcm) {
-
-		struct snd_soc_pcm_runtime *be = dpcm->be;
-		struct snd_pcm_substream *be_substream =
-			snd_soc_dpcm_get_substream(be, stream);
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
 
 		/* is this op for this BE ? */
 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
@@ -1929,11 +1929,13 @@ int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
 	return 0;
 
 unwind:
+	dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
+		__func__, be->dai_link->name, ret);
+
 	/* disable any enabled and non active backends */
 	for_each_dpcm_be_rollback(fe, stream, dpcm) {
-		struct snd_soc_pcm_runtime *be = dpcm->be;
-		struct snd_pcm_substream *be_substream =
-			snd_soc_dpcm_get_substream(be, stream);
+		be = dpcm->be;
+		be_substream = snd_soc_dpcm_get_substream(be, stream);
 
 		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
 			continue;
@@ -1966,10 +1968,8 @@ static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
 	memcpy(&fe->dpcm[stream].hw_params, params,
 			sizeof(struct snd_pcm_hw_params));
 	ret = dpcm_be_dai_hw_params(fe, stream);
-	if (ret < 0) {
-		dev_err(fe->dev,"ASoC: hw_params BE failed %d\n", ret);
+	if (ret < 0)
 		goto out;
-	}
 
 	dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
 			fe->dai_link->name, params_rate(params),
@@ -1985,6 +1985,10 @@ static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
 out:
 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
 	mutex_unlock(&fe->card->mutex);
+
+	if (ret < 0)
+		dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, ret);
+
 	return ret;
 }
 
-- 
2.25.1