linux-kernel - Re: [PATCH][next] iio: adc: ad7476: remove redundant null check on an array

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Message-ID: <20200425180243.18ff7f13@archlinux>
Date:   Sat, 25 Apr 2020 18:02:43 +0100
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "lars@...afoo.de" <lars@...afoo.de>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "knaack.h@....de" <knaack.h@....de>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] iio: adc: ad7476: remove redundant null check on
 an array

On Sat, 25 Apr 2020 18:01:10 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Fri, 24 Apr 2020 15:01:26 +0000
> "Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:
> 
> > On Fri, 2020-04-24 at 14:04 +0100, Colin King wrote:  
> > > From: Colin Ian King <colin.king@...onical.com>
> > > 
> > > The null check on st->chip_info->convst_channel is redundant because
> > > convst_channel is a 2 element array of struct iio_chan_spec objects
> > > and this can never be null. Fix this by removing the null check.
> > >     
> > 
> > Reviewed-by: Alexandru Ardelean <alexandru.ardelean@...log.com>  
> Applied to the togreg branch of iio.git and pushed out as testing.
> I didn't take this as a fix as it's not doing any harm in the meantime
> whilst this patch goes the slow route.
Just noticed this is in next only currently!  Hence can definitely
got he slow route as doesn't apply to mainline :)

Jonathan

> 
> Thanks,
> 
> Jonathan
> 
> >   
> > > Addresses-Coverity: ("Array compared against 0")
> > > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > > ---
> > >  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 */
> > >      
>