iio: inkern: fix iio_convert_raw_to_processed_unlocked
When reading IIO_CHAN_INFO_OFFSET, the return value of iio_channel_read() for
success will be IIO_VAL*, checking for 0 is not correct.
Without this fix the offset applied by iio drivers will be ignored when
converting a raw value to one in appropriate base units (e.g mV) in
a IIO client drivers that use iio_convert_raw_to_processed including
iio-hwmon.
Cc: <stable@vger.kernel.org> # 3.10.x
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 98ddc32..0cf5f8e 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -451,7 +451,7 @@
int ret;
ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET);
- if (ret == 0)
+ if (ret >= 0)
raw64 += offset;
scale_type = iio_channel_read(chan, &scale_val, &scale_val2,