iio: adc: ina2xx: Clarify size requirement for data buffer

The timestamp is inserted into the buffer after the sample data by
iio_push_to_buffers_with_timestamp, document the space requirement for
the timestamp.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 3195f87..8c81204 100644 (file)
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -700,7 +700,8 @@ static const struct iio_chan_spec ina219_channels[] = {
 static int ina2xx_work_buffer(struct iio_dev *indio_dev)
 {
        struct ina2xx_chip_info *chip = iio_priv(indio_dev);
-       unsigned short data[8];
+       /* data buffer needs space for channel data and timestap */
+       unsigned short data[4 + sizeof(s64)/sizeof(short)];
        int bit, ret, i = 0;
        s64 time_a, time_b;
        unsigned int alert;