linux-kernel - [PATCH 5.4 042/177] iio: adc: ad7606: fix reading unnecessary data from device

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Message-Id: <20191216174829.672720972@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:48:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Robert Wörle <rwoerle@...tec.de>,
        Beniamin Bia <beniamin.bia@...log.com>, Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.4 042/177] iio: adc: ad7606: fix reading unnecessary data from device

From: Beniamin Bia <beniamin.bia@...log.com>

commit 341826a065660d1b77d89e6335b6095cd654271c upstream.

When a conversion result is being read from ADC, the driver reads the
number of channels + 1 because it thinks that IIO_CHAN_SOFT_TIMESTAMP
is also a physical channel. This patch fixes this issue.

Fixes: 2985a5d88455 ("staging: iio: adc: ad7606: Move out of staging")
Reported-by: Robert Wörle <rwoerle@...tec.de>
Signed-off-by: Beniamin Bia <beniamin.bia@...log.com>
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/adc/ad7606.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -85,7 +85,7 @@ err_unlock:
 
 static int ad7606_read_samples(struct ad7606_state *st)
 {
-	unsigned int num = st->chip_info->num_channels;
+	unsigned int num = st->chip_info->num_channels - 1;
 	u16 *data = st->data;
 	int ret;