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From: Alexandru Ardelean <aardelean@deviqon.com>
To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: jic23@kernel.org, Jonathan.Cameron@huawei.com,
	alexandru.tachici@analog.com, linux@deviqon.com,
	Alexandru Ardelean <aardelean@deviqon.com>
Subject: [PATCH v4 04/12] iio: adc: ad7192: handle regulator voltage error first
Date: Thu, 13 May 2021 15:07:44 +0300	[thread overview]
Message-ID: <20210513120752.90074-5-aardelean@deviqon.com> (raw)
In-Reply-To: <20210513120752.90074-1-aardelean@deviqon.com>

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.

Fixes: ab0afa65bbc7 ("staging: iio: adc: ad7192: fail probe on get_voltage")
Cc: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
---
 drivers/iio/adc/ad7192.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index d3be67aa0522..1141cc13a124 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -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


  parent reply	other threads:[~2021-05-13 12:09 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-13 12:07 [PATCH v4 00/12] ad_sigma_delta: convert all drivers to device-managed Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 01/12] iio: adc: ad7124: Fix missbalanced regulator enable / disable on error Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 02/12] iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 03/12] iio: adc: ad7192: Avoid disabling a clock that was never enabled Alexandru Ardelean
2021-05-13 12:07 ` Alexandru Ardelean [this message]
2021-05-13 15:38   ` [PATCH v4 04/12] iio: adc: ad7192: handle regulator voltage error first Jonathan Cameron
2021-05-13 12:07 ` [PATCH v4 05/12] iio: adc: ad_sigma_delta: introduct devm_ad_sd_setup_buffer_and_trigger() Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 06/12] iio: adc: ad7793: convert to device-managed functions Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 07/12] iio: adc: ad7791: " Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 08/12] iio: adc: ad7780: " Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 09/12] iio: adc: ad7192: use devm_clk_get_optional() for mclk Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 10/12] iio: adc: ad7192: convert to device-managed functions Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 11/12] iio: adc: ad7124: Use devm_ managed calls for all of probe() + drop remove() Alexandru Ardelean
2021-05-13 12:07 ` [PATCH v4 12/12] iio: adc: ad_sigma_delta: remove ad_sd_{setup,cleanup}_buffer_and_trigger() Alexandru Ardelean
2021-06-09 20:09 ` [PATCH v4 00/12] ad_sigma_delta: convert all drivers to device-managed Jonathan Cameron

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