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

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Message-ID: <20210513165236.586b8beb@jic23-huawei>
Date:   Thu, 13 May 2021 16:52:36 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <ardeleanalex@...il.com>
Cc:     Lucas Stankus <lucas.p.stankus@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        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 Wed, 12 May 2021 20:20:02 +0300
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]
> 
> so, maybe something like:
> 
> Fixes: 83e416f458d53 ("staging: iio: adc: Replace, rewrite ad7745 from
> scratch.")

ouch.  Given I was queuing up some fixes I've added this one to the fixes-togreg
branch of iio.git and marked it for stable.

So drop this one from your v2 series with the changes requested in patch 1.

Thanks,

Jonathan

> 
> >         indio_dev->modes = INDIO_DIRECT_MODE;
> >
> >         if (pdata) {
> > --
> > 2.31.1
> >