[PATCH] iio: adc: ti-ads131e08: Fix trigger reference leak in ads131e08_probe()

[Wentao Liang <vulab@iscas.ac.cn>]

The reference taken with iio_trigger_get() is only dropped by
iio_dev_release() when INDIO_BUFFER_TRIGGERED is set. If
devm_iio_triggered_buffer_setup() fails before setting that mode, the
reference acquired for indio_dev->trig leaks. Move the
iio_trigger_get() after the buffer setup succeeds.

Fixes: d935eddd2799 ("iio: adc: Add driver for Texas Instruments ADS131E0x ADC family")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/iio/adc/ti-ads131e08.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ti-ads131e08.c b/drivers/iio/adc/ti-ads131e08.c
index a585621b0bc3..d976214504c3 100644
--- a/drivers/iio/adc/ti-ads131e08.c
+++ b/drivers/iio/adc/ti-ads131e08.c
@@ -851,8 +851,6 @@ static int ads131e08_probe(struct spi_device *spi)
 		return ret;
 	}
 
-	indio_dev->trig = iio_trigger_get(st->trig);
-
 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
 		NULL, &ads131e08_trigger_handler, NULL);
 	if (ret) {
@@ -860,6 +858,8 @@ static int ads131e08_probe(struct spi_device *spi)
 		return ret;
 	}
 
+	indio_dev->trig = iio_trigger_get(st->trig);
+
 	st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref");
 	if (!IS_ERR(st->vref_reg)) {
 		ret = regulator_enable(st->vref_reg);
-- 
2.34.1