patch "iio: Fix iio_multiply_value use in iio_read_channel_processed_scale" added to char-misc-linus

patch "iio: Fix iio_multiply_value use in iio_read_channel_processed_scale" added to char-misc-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    iio: Fix iio_multiply_value use in iio_read_channel_processed_scale

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.


From bb21ee31f5753a7972148798fd7dfb841dd33bdb Mon Sep 17 00:00:00 2001
From: Svyatoslav Ryhel <clamor95@gmail.com>
Date: Thu, 16 Apr 2026 14:14:42 +0300
Subject: iio: Fix iio_multiply_value use in iio_read_channel_processed_scale

The function iio_multiply_value returns IIO_VAL_INT (1) on success or a
negative error number on failure, while iio_read_channel_processed_scale
should return an error code or 0. This creates a situation where the
expected result is treated as an error. Fix this by checking the
iio_multiply_value result separately, instead of passing it as a return
value.

Fixes: 05f958d003c9 ("iio: Improve iio_read_channel_processed_scale() precision")
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---
 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 0df0ab3de270..9ce20cb05a9b 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -738,7 +738,11 @@ int iio_read_channel_processed_scale(struct iio_channel *chan, int *val,
 		if (ret < 0)
 			return ret;
 
-		return iio_multiply_value(val, scale, ret, pval, pval2);
+		ret = iio_multiply_value(val, scale, ret, pval, pval2);
+		if (ret < 0)
+			return ret;
+
+		return 0;
 	} else {
 		ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
 		if (ret < 0)
-- 
2.54.0