linux-kernel - [PATCH] extcon: arizona: Correct error handling on regmap_update_bits

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Date:   Tue, 28 May 2019 17:50:20 +0100
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <cw00.choi@...sung.com>
CC:     <myungjoo.ham@...sung.com>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] extcon: arizona: Correct error handling on regmap_update_bits_check

Ensure the case when regmap_update_bits_check fails and the change
variable is not updated is handled correctly.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 drivers/extcon/extcon-arizona.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 9327479c719c2..ba2d16de161f8 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -335,10 +335,12 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
 
 	arizona_extcon_pulse_micbias(info);
 
-	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
-				 ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
-				 &change);
-	if (!change) {
+	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				       ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
+				       &change);
+	if (ret < 0) {
+		dev_err(arizona->dev, "Failed to enable micd: %d\n", ret);
+	} else if (!change) {
 		regulator_disable(info->micvdd);
 		pm_runtime_put_autosuspend(info->dev);
 	}
@@ -350,12 +352,14 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
 	const char *widget = arizona_extcon_get_micbias(info);
 	struct snd_soc_dapm_context *dapm = arizona->dapm;
 	struct snd_soc_component *component = snd_soc_dapm_to_component(dapm);
-	bool change;
+	bool change = false;
 	int ret;
 
-	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
-				 ARIZONA_MICD_ENA, 0,
-				 &change);
+	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				       ARIZONA_MICD_ENA, 0,
+				       &change);
+	if (ret < 0)
+		dev_err(arizona->dev, "Failed to disable micd: %d\n", ret);
 
 	ret = snd_soc_component_disable_pin(component, widget);
 	if (ret != 0)
@@ -1726,7 +1730,7 @@ static int arizona_extcon_remove(struct platform_device *pdev)
 	struct arizona_extcon_info *info = platform_get_drvdata(pdev);
 	struct arizona *arizona = info->arizona;
 	int jack_irq_rise, jack_irq_fall;
-	bool change;
+	bool change = false;
 
 	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
 				 ARIZONA_MICD_ENA, 0,
-- 
2.11.0