From 04f5b9f539ce314f758d919a14dc7a669f3b7838 Mon Sep 17 00:00:00 2001
From: Lucas Stankus <lucas.p.stankus@gmail.com>
Date: Tue, 11 May 2021 17:54:18 -0300
Subject: [PATCH] staging: iio: cdc: ad7746: avoid overwrite of num_channels
Git-commit: 04f5b9f539ce314f758d919a14dc7a669f3b7838
Patch-mainline: v5.13-rc4
References: git-fixes

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@gmail.com>
Fixes: 83e416f458d53 ("staging: iio: adc: Replace, rewrite ad7745 from scratch.")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: <Stable@vger.kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/staging/iio/cdc/ad7746.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index dfd71e99e872..eab534dc4bcc 100644
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -700,7 +700,6 @@ static int ad7746_probe(struct i2c_client *client,
 		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) {
-- 
2.26.2