From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Fabien Proriol , Jonathan Cameron , Sasha Levin Subject: [PATCH AUTOSEL 3.18 21/98] iio: iio: Fix iio_channel_read return if channel havn't info Date: Thu, 25 Oct 2018 10:17:36 -0400 Message-Id: <20181025141853.214051-21-sashal@kernel.org> In-Reply-To: <20181025141853.214051-1-sashal@kernel.org> References: <20181025141853.214051-1-sashal@kernel.org> List-ID: From: Fabien Proriol [ Upstream commit 65de7654d39c70c2b942f801cea01590cf7e3458 ] 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 Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/inkern.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index f0846108d006..d33590e89337 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -426,6 +426,9 @@ static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, 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, -- 2.17.1