staging: iio: cdc: ad7746: avoid overwrite of num_channels

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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index 5771d4ee8ef106755b84a82cf8bbc7bc350b53f2..1a71bca4e6988a3595ccfb58b8667f55ba1eedf9 100644 (file)
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -714,7 +714,6 @@ 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) {