linux-kernel - [PATCH RESEND 1/3] ASoC: codecs: wcd937x: Simplify locking with guard()

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Message-Id: <20241209-cleanup-h-guard-of-node-asoc-v1-1-397f6385e4a5@linaro.org>
Date: Mon, 09 Dec 2024 13:00:28 +0100
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 RESEND 1/3] ASoC: codecs: wcd937x: 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/wcd937x.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/wcd937x.c b/sound/soc/codecs/wcd937x.c
index c9d5e67bf66e4e8e21a76cfd563c75bac6555513..7d8f995d2daff50708e361fa446b52898c0faa81 100644
--- a/sound/soc/codecs/wcd937x.c
+++ b/sound/soc/codecs/wcd937x.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2023-2024 Qualcomm Innovation Center, Inc. All rights reserved.
 
+#include <linux/cleanup.h>
 #include <linux/component.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -1445,7 +1446,7 @@ static int wcd937x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 					    int req_volt, int micb_num)
 {
 	struct wcd937x_priv *wcd937x = snd_soc_component_get_drvdata(component);
-	int cur_vout_ctl, req_vout_ctl, micb_reg, micb_en, ret = 0;
+	int cur_vout_ctl, req_vout_ctl, micb_reg, micb_en;
 
 	switch (micb_num) {
 	case MIC_BIAS_1:
@@ -1460,7 +1461,9 @@ static int wcd937x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 	default:
 		return -EINVAL;
 	}
-	mutex_lock(&wcd937x->micb_lock);
+
+	guard(mutex)(&wcd937x->micb_lock);
+
 	/*
 	 * If requested micbias voltage is same as current micbias
 	 * voltage, then just return. Otherwise, adjust voltage as
@@ -1475,15 +1478,11 @@ static int wcd937x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 						    WCD937X_MICB_VOUT_MASK);
 
 	req_vout_ctl = wcd937x_get_micb_vout_ctl_val(req_volt);
-	if (req_vout_ctl < 0) {
-		ret = -EINVAL;
-		goto exit;
-	}
+	if (req_vout_ctl < 0)
+		return -EINVAL;
 
-	if (cur_vout_ctl == req_vout_ctl) {
-		ret = 0;
-		goto exit;
-	}
+	if (cur_vout_ctl == req_vout_ctl)
+		return 0;
 
 	if (micb_en == WCD937X_MICB_ENABLE)
 		snd_soc_component_write_field(component, micb_reg,
@@ -1504,9 +1503,8 @@ static int wcd937x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,
 		 */
 		usleep_range(2000, 2100);
 	}
-exit:
-	mutex_unlock(&wcd937x->micb_lock);
-	return ret;
+
+	return 0;
 }
 
 static int wcd937x_mbhc_micb_ctrl_threshold_mic(struct snd_soc_component *component,

-- 
2.43.0