linux-kernel - [PATCH v1 2/9] iio: inkern: error out on unsupported offset type

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Date:   Sat, 29 May 2021 20:59:10 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     liambeguin@...il.com, peda@...ntia.se, jic23@...nel.org,
        lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: [PATCH v1 2/9] iio: inkern: error out on unsupported offset type

From: Liam Beguin <lvb@...hos.com>

iio_convert_raw_to_processed_unlocked() assumes the offset is an
integer. Make that clear to the consumer by returning an error when an
unsupported offset type is detected.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 drivers/iio/inkern.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 4b6a8e11116a..dede4536d499 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -595,8 +595,12 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
 	int ret;
 
 	ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET);
-	if (ret >= 0)
+	if (ret == IIO_VAL_INT) {
 		raw64 += offset;
+	} else if (ret >= 0) {
+		dev_err(&chan->indio_dev->dev, "unsupported offset type");
+		return -EINVAL;
+	}
 
 	scale_type = iio_channel_read(chan, &scale_val, &scale_val2,
 					IIO_CHAN_INFO_SCALE);
-- 
2.30.1.489.g328c10930387