linux-kernel - [PATCH 3/3] ASoC: codecs: wcd939x: Simplify locking with guard()

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Message-Id: <20240823-cleanup-h-guard-of-node-asoc-v1-3-2349bd7fb7f4@linaro.org>
Date: Fri, 23 Aug 2024 18:21:31 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/3] ASoC: codecs: wcd939x: Simplify locking with guard()

Simplify error handling with guard(mutex), which allows to drop local
'ret' variable and to directly return instead of jumping.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 sound/soc/codecs/wcd939x.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/wcd939x.c b/sound/soc/codecs/wcd939x.c
index 68fc591670dc..a77e4b8b3931 100644
--- a/sound/soc/codecs/wcd939x.c
+++ b/sound/soc/codecs/wcd939x.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2023, Linaro Limited
  */
 
+#include <linux/cleanup.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
@@ -1933,7 +1934,6 @@ static int wcd939x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 	struct wcd939x_priv *wcd939x = snd_soc_component_get_drvdata(component);
 	unsigned int micb_reg, cur_vout_ctl, micb_en;
 	int req_vout_ctl;
-	int ret = 0;
 
 	switch (micb_num) {
 	case MIC_BIAS_1:
@@ -1951,7 +1951,8 @@ static int wcd939x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 	default:
 		return -EINVAL;
 	}
-	mutex_lock(&wcd939x->micb_lock);
+
+	guard(mutex)(&wcd939x->micb_lock);
 
 	/*
 	 * If requested micbias voltage is same as current micbias
@@ -1967,15 +1968,11 @@ static int wcd939x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 						    WCD939X_MICB_VOUT_CTL);
 
 	req_vout_ctl = wcd939x_get_micb_vout_ctl_val(req_volt);
-	if (req_vout_ctl < 0) {
-		ret = req_vout_ctl;
-		goto exit;
-	}
+	if (req_vout_ctl < 0)
+		return req_vout_ctl;
 
-	if (cur_vout_ctl == req_vout_ctl) {
-		ret = 0;
-		goto exit;
-	}
+	if (cur_vout_ctl == req_vout_ctl)
+		return 0;
 
 	dev_dbg(component->dev, "%s: micb_num: %d, cur_mv: %d, req_mv: %d, micb_en: %d\n",
 		__func__, micb_num, WCD_VOUT_CTL_TO_MICB(cur_vout_ctl),
@@ -2000,9 +1997,7 @@ static int wcd939x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 		usleep_range(2000, 2100);
 	}
 
-exit:
-	mutex_unlock(&wcd939x->micb_lock);
-	return ret;
+	return 0;
 }
 
 static int wcd939x_mbhc_micb_ctrl_threshold_mic(struct snd_soc_component *component,

-- 
2.43.0