linux-kernel - Re: [PATCH 2/2] staging: iio: cdc: ad7746: avoid overwrite of num

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Message-ID: <20210518130833.00001807@Huawei.com>
Date:   Tue, 18 May 2021 13:08:33 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Lucas Stankus <lucas.p.stankus@...il.com>
CC:     Alexandru Ardelean <ardeleanalex@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        <linux-staging@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] staging: iio: cdc: ad7746: avoid overwrite of
 num_channels

On Mon, 17 May 2021 21:55:20 -0300
Lucas Stankus <lucas.p.stankus@...il.com> wrote:

> On Wed, May 12, 2021 at 2:20 PM Alexandru Ardelean
> <ardeleanalex@...il.com> wrote:
> >
> > On Tue, May 11, 2021 at 11:55 PM Lucas Stankus
> > <lucas.p.stankus@...il.com> wrote:  
> > >
> > > 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>
> > > ---
> > >  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 e03d010b2f4c..9e0da43b2871 100644
> > > --- a/drivers/staging/iio/cdc/ad7746.c
> > > +++ b/drivers/staging/iio/cdc/ad7746.c
> > > @@ -693,7 +693,6 @@ 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);  
> >
> > ohh; good catch
> >
> > this falls into the category of a fix, so a Fixes tag is required;
> > this looks so old, that i did not bother tracking it before
> > 83e416f458d53  [which is 2011]  
> 
> As Jonathan said, this bug was already fixed and the patch will be dropped,
> but thank you for the review.
> 
> This was my first bug fix in the kernel, so sorry for the absence of a
> Fixes tag, I'll make sure to add one next time.
> 

Wasn't already fixed - I just applied this patch without PATCH 1/2
so now it is ;)

Jonathan

> 
> >
> > so, maybe something like:
> >
> > Fixes: 83e416f458d53 ("staging: iio: adc: Replace, rewrite ad7745 from
> > scratch.")
> >  
> > >         indio_dev->modes = INDIO_DIRECT_MODE;
> > >
> > >         if (pdata) {
> > > --
> > > 2.31.1
> > >