[PATCH 05/15] iio: adc: check the result of ad_sd_init()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Josef Bacik <josef@toxicpanda.com>

ad_sd_init() asks for the optional "rdy" GPIO and returns the error if
that fails, for instance -EPROBE_DEFER. The binding of the AD7780
describes such a GPIO.

ad7780, ad7791, ad7793 and max11205 ignore the result. The function has
then returned before it set the driver data of the IIO device, which
devm_ad_sd_setup_buffer_and_trigger() dereferences a few lines further
down in these probe functions, and sigma_delta->rdy_gpiod holds an
ERR_PTR() which ad_sigma_delta_clear_pending_event() takes for a GPIO.

Return the error, as the other users of the library do.

Fixes: a87ef09b1fdf ("iio: adc: ad_sigma_delta: Add support for reading irq status using a GPIO")
Cc: stable <stable@kernel.org>
Cc: "Nuno Sá" <nuno.sa@analog.com>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Renato Lui Geh <renatogeh@gmail.com>
Cc: David Lechner <dlechner@baylibre.com>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: Ramona Bolboaca <ramona.bolboaca@analog.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@baylibre.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/adc/ad7780.c   | 4 +++-
 drivers/iio/adc/ad7791.c   | 4 +++-
 drivers/iio/adc/ad7793.c   | 4 +++-
 drivers/iio/adc/max11205.c | 4 +++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index 1cfad70320fe..c1428f30241c 100644
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -311,7 +311,9 @@ static int ad7780_probe(struct spi_device *spi)
 	st = iio_priv(indio_dev);
 	st->gain = 1;
 
-	ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);
+	ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);
+	if (ret)
+		return ret;
 
 	st->chip_info =
 		&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];
diff --git a/drivers/iio/adc/ad7791.c b/drivers/iio/adc/ad7791.c
index c2688307bbba..10aa40ca35e7 100644
--- a/drivers/iio/adc/ad7791.c
+++ b/drivers/iio/adc/ad7791.c
@@ -435,7 +435,9 @@ static int ad7791_probe(struct spi_device *spi)
 		return ret;
 
 	st->info = &ad7791_chip_infos[spi_get_device_id(spi)->driver_data];
-	ad_sd_init(&st->sd, indio_dev, spi, &ad7791_sigma_delta_info);
+	ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7791_sigma_delta_info);
+	if (ret)
+		return ret;
 
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index b0f44c144f20..937c8b09ad45 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -796,7 +796,9 @@ static int ad7793_probe(struct spi_device *spi)
 
 	st = iio_priv(indio_dev);
 
-	ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info);
+	ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info);
+	if (ret)
+		return ret;
 
 	if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
 		ret = devm_regulator_get_enable_read_voltage(dev, "refin");
diff --git a/drivers/iio/adc/max11205.c b/drivers/iio/adc/max11205.c
index 53ac2f4f383e..e46e90400bdc 100644
--- a/drivers/iio/adc/max11205.c
+++ b/drivers/iio/adc/max11205.c
@@ -114,7 +114,9 @@ static int max11205_probe(struct spi_device *spi)
 
 	st = iio_priv(indio_dev);
 
-	ad_sd_init(&st->sd, indio_dev, spi, &max11205_sigma_delta_info);
+	ret = ad_sd_init(&st->sd, indio_dev, spi, &max11205_sigma_delta_info);
+	if (ret)
+		return ret;
 
 	st->chip_info = spi_get_device_match_data(spi);
 	if (!st->chip_info)

-- 
2.56.0