[PATCH] ASoC: reduce verbosity of error messages for sof-dai and sof-link

[Pierre-Louis Bossart]

Recent changes result in multiple dmesg traces such as:

[ 14.410435] Audio Port: ASoC: error at snd_soc_link_startup on Audio
Port: 1

[ 14.410446] sst-mfld-platform sst-mfld-platform: ASoC: error at
snd_soc_dai_startup on media-cpu-dai: 1

These messages are not really errors, when dai and dai-link callbacks
return the value of e.g. snd_pcm_hw_constraint_single() the result is
"Positive if the value is changed, zero if it's not changed, or a
negative error code"

Add a simple test to only log errors when the result is
negative.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/soc-dai.c  | 7 ++++---
 sound/soc/soc-link.c | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-dai.c b/sound/soc/soc-dai.c
index 2c6ac3b0afa5..6a0e7560bacc 100644
--- a/sound/soc/soc-dai.c
+++ b/sound/soc/soc-dai.c
@@ -20,9 +20,10 @@ static inline int _soc_dai_ret(struct snd_soc_dai *dai,
 	case 0:
 		break;
 	default:
-		dev_err(dai->dev,
-			"ASoC: error at %s on %s: %d\n",
-			func, dai->name, ret);
+		if (ret < 0)
+			dev_err(dai->dev,
+				"ASoC: error at %s on %s: %d\n",
+				func, dai->name, ret);
 	}
 
 	return ret;
diff --git a/sound/soc/soc-link.c b/sound/soc/soc-link.c
index 248e1be4e1eb..ff053d4c1a49 100644
--- a/sound/soc/soc-link.c
+++ b/sound/soc/soc-link.c
@@ -18,9 +18,10 @@ static inline int _soc_link_ret(struct snd_soc_pcm_runtime *rtd,
 	case 0:
 		break;
 	default:
-		dev_err(rtd->dev,
-			"ASoC: error at %s on %s: %d\n",
-			func, rtd->dai_link->name, ret);
+		if (ret < 0)
+			dev_err(rtd->dev,
+				"ASoC: error at %s on %s: %d\n",
+				func, rtd->dai_link->name, ret);
 	}
 
 	return ret;

base-commit: 4a0434502191347ba8f99468f2fb2cdddc20d381
-- 
2.20.1