iio: iio: Fix iio_channel_read return if channel havn't info
When xilinx-xadc is used with hwmon driver to read voltage, offset used
for temperature is always applied whatever the channel.
iio_channel_read must return an error to avoid offset for channel
without IIO_CHAN_INFO_OFFSET property.
Signed-off-by: Fabien Proriol <fabien.proriol@jdsu.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f084610..d33590e 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -426,6 +426,9 @@
if (val2 == NULL)
val2 = &unused;
+ if(!iio_channel_has_info(chan->channel, info))
+ return -EINVAL;
+
if (chan->indio_dev->info->read_raw_multi) {
ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev,
chan->channel, INDIO_MAX_RAW_ELEMENTS,