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patch "iio: adc: ad7124: Fix missbalanced regulator enable / disable on" added to staging-linus

PATCH [email protected] 1 participant 1 message May 22, 2021

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Stable branch IIO Analog Devices IIO drivers
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This is a note to let you know that I've just added the patch titled

iio: adc: ad7124: Fix missbalanced regulator enable / disable on

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 4573472315f0fa461330545ff2aa2f6da0b1ae76 Mon Sep 17 00:00:00 2001
From: Jonathan Cameron <[email protected]>
Date: Thu, 13 May 2021 15:07:41 +0300
Subject: iio: adc: ad7124: Fix missbalanced regulator enable / disable on
error.

If the devm_regulator_get() call succeeded but not the regulator_enable() then regulator_disable() would be called on a regulator that was not enabled.

Fix this by moving regulator enabling / disabling over to devm_ management via devm_add_action_or_reset.

Alexandru's sign-off here because he pulled Jonathan's patch into a larger set which Jonathan then applied.

Fixes b3af341bbd96 ("iio: adc: Add ad7124 support")
Reviewed-by Alexandru Ardelean <[email protected]>
Signed-off-by Jonathan Cameron <[email protected]>
Signed-off-by Alexandru Ardelean <[email protected]>
Cc <[email protected]>
---
 drivers/iio/adc/ad7124.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)
drivers/iio/adc/ad7124.c +13 -16
index 9d3952b4674f..437116a07cf1 100644
@@ -850,6 +850,11 @@ static int ad7124_setup(struct ad7124_state *st)
 	return ret;
 }
 
+static void ad7124_reg_disable(void *r)
+{
+	regulator_disable(r);
+}
+
 static int ad7124_probe(struct spi_device *spi)
 {
 	const struct ad7124_chip_info *info;

@@ -895,17 +900,20 @@ static int ad7124_probe(struct spi_device *spi)
 		ret = regulator_enable(st->vref[i]);
 		if (ret)
 			return ret;
+
+		ret = devm_add_action_or_reset(&spi->dev, ad7124_reg_disable,
+					       st->vref[i]);
+		if (ret)
+			return ret;
 	}
 
 	st->mclk = devm_clk_get(&spi->dev, "mclk");
-	if (IS_ERR(st->mclk)) {
-		ret = PTR_ERR(st->mclk);
-		goto error_regulator_disable;
-	}
+	if (IS_ERR(st->mclk))
+		return PTR_ERR(st->mclk);
 
 	ret = clk_prepare_enable(st->mclk);
 	if (ret < 0)
-		goto error_regulator_disable;
+		return ret;
 
 	ret = ad7124_soft_reset(st);
 	if (ret < 0)

@@ -935,11 +943,6 @@ static int ad7124_probe(struct spi_device *spi)
 	ad_sd_cleanup_buffer_and_trigger(indio_dev);
 error_clk_disable_unprepare:
 	clk_disable_unprepare(st->mclk);
-error_regulator_disable:
-	for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) {
-		if (!IS_ERR_OR_NULL(st->vref[i]))
-			regulator_disable(st->vref[i]);
-	}
 
 	return ret;
 }

@@ -948,17 +951,11 @@ static int ad7124_remove(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
 	struct ad7124_state *st = iio_priv(indio_dev);
-	int i;
 
 	iio_device_unregister(indio_dev);
 	ad_sd_cleanup_buffer_and_trigger(indio_dev);
 	clk_disable_unprepare(st->mclk);
 
-	for (i = ARRAY_SIZE(st->vref) - 1; i >= 0; i--) {
-		if (!IS_ERR_OR_NULL(st->vref[i]))
-			regulator_disable(st->vref[i]);
-	}
-
 	return 0;
 }
Signature · 1 line
2.31.1