patch "iio: adc: ad7192: handle regulator voltage error first" added to staging-linus

This is a note to let you know that I've just added the patch titled

iio: adc: ad7192: handle regulator voltage error first

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 b0f27fca5a6c7652e265aae6a4452ce2f2ed64da Mon Sep 17 00:00:00 2001
From: Alexandru Ardelean <[email protected]>
Date: Thu, 13 May 2021 15:07:44 +0300
Subject: iio: adc: ad7192: handle regulator voltage error first

This change fixes a corner-case, where for a zero regulator value, the driver would exit early, initializing the driver only partially. The driver would be in an unknown state.

This change reworks the code to check regulator_voltage() return value for negative (error) first, and return early. This is the more common idiom.

Also, this change is removing the 'voltage_uv' variable and using the 'ret' value directly. The only place where 'voltage_uv' is being used is to compute the internal reference voltage, and the type of this variable is 'int' (same are for 'ret'). Using only 'ret' avoids having to assign it on the error path.

---
 drivers/iio/adc/ad7192.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

index d3be67aa0522..1141cc13a124 100644
@@ -912,7 +912,7 @@ static int ad7192_probe(struct spi_device *spi)
 {
 	struct ad7192_state *st;
 	struct iio_dev *indio_dev;
-	int ret, voltage_uv = 0;
+	int ret;
 
 	if (!spi->irq) {
 		dev_err(&spi->dev, "no IRQ?\n");

@@ -949,15 +949,12 @@ static int ad7192_probe(struct spi_device *spi)
 		goto error_disable_avdd;
 	}
 
-	voltage_uv = regulator_get_voltage(st->avdd);
-
-	if (voltage_uv > 0) {
-		st->int_vref_mv = voltage_uv / 1000;
-	} else {
-		ret = voltage_uv;
+	ret = regulator_get_voltage(st->avdd);
+	if (ret < 0) {
 		dev_err(&spi->dev, "Device tree error, reference voltage undefined\n");
 		goto error_disable_avdd;
 	}
+	st->int_vref_mv = ret / 1000;
 
 	spi_set_drvdata(spi, indio_dev);
 	st->chip_info = of_device_get_match_data(&spi->dev);

2.31.1