linux-kernel - [PATCH 5.12 075/296] staging: iio: cdc: ad7746: avoid overwrite of num

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Message-Id: <20210531130706.375225101@linuxfoundation.org>
Date:   Mon, 31 May 2021 15:12:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lucas Stankus <lucas.p.stankus@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Stable@...r.kernel.org
Subject: [PATCH 5.12 075/296] staging: iio: cdc: ad7746: avoid overwrite of num_channels

From: Lucas Stankus <lucas.p.stankus@...il.com>

commit 04f5b9f539ce314f758d919a14dc7a669f3b7838 upstream.

AD7745 devices don't have the CIN2 pins and therefore can't handle related
channels. Forcing the number of AD7746 channels may lead to enabling more
channels than what the hardware actually supports.
Avoid num_channels being overwritten after first assignment.

Signed-off-by: Lucas Stankus <lucas.p.stankus@...il.com>
Fixes: 83e416f458d53 ("staging: iio: adc: Replace, rewrite ad7745 from scratch.")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: <Stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/iio/cdc/ad7746.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -700,7 +700,6 @@ static int ad7746_probe(struct i2c_clien
 		indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
 	else
 		indio_dev->num_channels =  ARRAY_SIZE(ad7746_channels) - 2;
-	indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	if (pdata) {