linux-kernel - [PATCH 1/4] iio: health: afe4403: Use devm action helper for regulator disable

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Date: Tue, 23 Jan 2024 08:09:15 -0600
From: Andrew Davis <afd@...com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Andrew Davis
	<afd@...com>
Subject: [PATCH 1/4] iio: health: afe4403: Use devm action helper for regulator disable

Use a device lifecycle managed action for regulator disable function.
This helps prevent mistakes like unregistering out of order in cleanup
functions and forgetting to unregister on error paths.

Signed-off-by: Andrew Davis <afd@...com>
---
 drivers/iio/health/afe4403.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/health/afe4403.c b/drivers/iio/health/afe4403.c
index df3bc5c3d3786..9e9d6de2a7c83 100644
--- a/drivers/iio/health/afe4403.c
+++ b/drivers/iio/health/afe4403.c
@@ -346,6 +346,13 @@ static irqreturn_t afe4403_trigger_handler(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
+static void afe4403_regulator_disable(void *data)
+{
+	struct regulator *regulator = data;
+
+	regulator_disable(regulator);
+}
+
 #define AFE4403_TIMING_PAIRS			\
 	{ AFE440X_LED2STC,	0x000050 },	\
 	{ AFE440X_LED2ENDC,	0x0003e7 },	\
@@ -495,19 +502,24 @@ static int afe4403_probe(struct spi_device *spi)
 		dev_err(afe->dev, "Unable to enable regulator\n");
 		return ret;
 	}
+	ret = devm_add_action_or_reset(afe->dev, afe4403_regulator_disable, afe->regulator);
+	if (ret) {
+		dev_err(afe->dev, "Unable to add regulator disable action\n");
+		return ret;
+	}
 
 	ret = regmap_write(afe->regmap, AFE440X_CONTROL0,
 			   AFE440X_CONTROL0_SW_RESET);
 	if (ret) {
 		dev_err(afe->dev, "Unable to reset device\n");
-		goto err_disable_reg;
+		return ret;
 	}
 
 	ret = regmap_multi_reg_write(afe->regmap, afe4403_reg_sequences,
 				     ARRAY_SIZE(afe4403_reg_sequences));
 	if (ret) {
 		dev_err(afe->dev, "Unable to set register defaults\n");
-		goto err_disable_reg;
+		return ret;
 	}
 
 	indio_dev->modes = INDIO_DIRECT_MODE;
@@ -523,8 +535,7 @@ static int afe4403_probe(struct spi_device *spi)
 						   iio_device_id(indio_dev));
 		if (!afe->trig) {
 			dev_err(afe->dev, "Unable to allocate IIO trigger\n");
-			ret = -ENOMEM;
-			goto err_disable_reg;
+			return -ENOMEM;
 		}
 
 		iio_trigger_set_drvdata(afe->trig, indio_dev);
@@ -532,7 +543,7 @@ static int afe4403_probe(struct spi_device *spi)
 		ret = iio_trigger_register(afe->trig);
 		if (ret) {
 			dev_err(afe->dev, "Unable to register IIO trigger\n");
-			goto err_disable_reg;
+			return ret;
 		}
 
 		ret = devm_request_threaded_irq(afe->dev, afe->irq,
@@ -566,8 +577,6 @@ static int afe4403_probe(struct spi_device *spi)
 err_trig:
 	if (afe->irq > 0)
 		iio_trigger_unregister(afe->trig);
-err_disable_reg:
-	regulator_disable(afe->regulator);
 
 	return ret;
 }
@@ -584,10 +593,6 @@ static void afe4403_remove(struct spi_device *spi)
 
 	if (afe->irq > 0)
 		iio_trigger_unregister(afe->trig);
-
-	ret = regulator_disable(afe->regulator);
-	if (ret)
-		dev_warn(afe->dev, "Unable to disable regulator\n");
 }
 
 static const struct spi_device_id afe4403_ids[] = {
-- 
2.39.2