linux-kernel - [PATCH 10/16] iio: adc: max1027: Prevent single channel accesses during buffer reads

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Message-Id: <20210818111139.330636-11-miquel.raynal@bootlin.com>
Date:   Wed, 18 Aug 2021 13:11:33 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-iio@...r.kernel.org, <linux-kernel@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 10/16] iio: adc: max1027: Prevent single channel accesses during buffer reads

When hardware buffers are enabled (the cnvst pin being the trigger), one
should not mess with the device state by requesting a single channel
read. Prevent it with a iio_buffer_enabled() check.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/iio/adc/max1027.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 223c9e4abd86..83526f3d7d3a 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -335,6 +335,8 @@ static int max1027_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
+		if (iio_buffer_enabled(indio_dev))
+			return -EBUSY;
 		ret = max1027_read_single_value(indio_dev, chan, val);
 		break;
 	case IIO_CHAN_INFO_SCALE:
-- 
2.27.0