linux-kernel - [PATCH] iio: adc: ad7476: fix clang -Wpointer-bool-conversion warning

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Date:   Tue,  5 May 2020 16:23:58 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Dragos Bogdan <dragos.bogdan@...log.com>,
        Beniamin Bia <beniamin.bia@...log.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] iio: adc: ad7476: fix clang -Wpointer-bool-conversion warning

Checking the pointer value of st->chip_info->convst_channel is pointless
since this this an array inside of a struct: even if st->chip_info is NULL,
the pointer is non-zero. Clang warns about this:

drivers/iio/adc/ad7476.c:312:40: warning: address of array 'st->chip_info->convst_channel' will always evaluate to 'true' [-Wpointer-bool-conversion]
        if (st->convst_gpio && st->chip_info->convst_channel)
                            ~~ ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~

I could not come up with a sane way to check whether the entry
is valid, so just remove the check and keep the behavior as it
is today but without the warning.

Fixes: 3a6af93dd66e ("iio: adc: ad7476: Add IIO_CHAN_INFO_RAW for AD7091R")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/iio/adc/ad7476.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index e9984a38fc4c..4e816d714ad2 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -309,7 +309,7 @@ static int ad7476_probe(struct spi_device *spi)
 	indio_dev->num_channels = 2;
 	indio_dev->info = &ad7476_info;
 
-	if (st->convst_gpio && st->chip_info->convst_channel)
+	if (st->convst_gpio)
 		indio_dev->channels = st->chip_info->convst_channel;
 	/* Setup default message */
 
-- 
2.26.0