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authorStefan Brüns <stefan.bruens@rwth-aachen.de>2017-07-26 23:32:06 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2017-07-30 14:50:19 +0100
commitff3aa88a4d61468baece3fc2bb54e2a3bea6360f (patch)
tree963771037ce6cdcf0f27604070ad6eb2bccf7aae /drivers/iio
parent90938ca432e6b8f6bb1c22a24984738fc3d906ed (diff)
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iio: adc: ina219: Avoid underflow for sleeping time
Proper support for the INA219 lowered the minimum sampling period from 2*140us to 2*84us. Subtracting 200us later leads to an underflow and an almost infinite udelay later. Using a signed int for the sampling period provides sufficient range (at most 2*8640*1024us), but catches the underflow when comparing with buffer_us. Fixes: 18edac2e22f4 ("iio: adc: Fix integration time/averaging for INA219/220") Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/ina2xx-adc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 232c0b80d658..c3f86138cb55 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -644,7 +644,7 @@ static int ina2xx_capture_thread(void *data)
{
struct iio_dev *indio_dev = data;
struct ina2xx_chip_info *chip = iio_priv(indio_dev);
- unsigned int sampling_us = SAMPLING_PERIOD(chip);
+ int sampling_us = SAMPLING_PERIOD(chip);
int buffer_us;
/*