[PATCH 4.19 021/338] iio: inkern: apply consumer scale when no channel scale is available

[Greg Kroah-Hartman]

From: Liam Beguin <liambeguin@xxxxxxxxx>

commit 14b457fdde38de594a4bc4bd9075019319d978da upstream.

When a consumer calls iio_read_channel_processed() and no channel scale
is available, it's assumed that the scale is one and the raw value is
returned as expected.

On the other hand, if the consumer calls iio_convert_raw_to_processed()
the scaling factor requested by the consumer is not applied.

This for example causes the consumer to process mV when expecting uV.
Make sure to always apply the scaling factor requested by the consumer.

Fixes: adc8ec5ff183 ("iio: inkern: pass through raw values if no scaling")
Signed-off-by: Liam Beguin <liambeguin@xxxxxxxxx>
Reviewed-by: Peter Rosin <peda@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220108205319.2046348-3-liambeguin@xxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iio/inkern.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -603,10 +603,10 @@ static int iio_convert_raw_to_processed_
 					IIO_CHAN_INFO_SCALE);
 	if (scale_type < 0) {
 		/*
-		 * Just pass raw values as processed if no scaling is
-		 * available.
+		 * If no channel scaling is available apply consumer scale to
+		 * raw value and return.
 		 */
-		*processed = raw;
+		*processed = raw * scale;
 		return 0;
 	}