linux-kernel - Re: [PATCH v3] iio: adc: Correct conditional logic for store mode

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Message-ID: <CAKUZ0zLW-X9oNxEhh++65y1cjX5c77v=kqqvGTaATaBXCs-Neg@mail.gmail.com>
Date: Fri, 18 Apr 2025 12:56:25 -0400
From: Gabriel Shahrouzi <gshahrouzi@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Nuno Sá <noname.nuno@...il.com>, 
	Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-iio@...r.kernel.org, 
	linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	skhan@...uxfoundation.org, kernelmentees@...ts.linuxfoundation.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH v3] iio: adc: Correct conditional logic for store mode

On Fri, Apr 18, 2025 at 11:18 AM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Tue, 15 Apr 2025 09:54:00 -0400
> Gabriel Shahrouzi <gshahrouzi@...il.com> wrote:
>
> > On Tue, Apr 15, 2025 at 5:13 AM Nuno Sá <noname.nuno@...il.com> wrote:
> > >
> > > On Mon, 2025-04-14 at 11:40 -0400, Gabriel Shahrouzi wrote:
> > > > The mode setting logic in ad7816_store_mode was reversed due to
> > > > incorrect handling of the strcmp return value. strcmp returns 0 on
> > > > match, so the `if (strcmp(buf, "full"))` block executed when the
> > > > input was not "full".
> > > >
> > > > This resulted in "full" setting the mode to AD7816_PD (power-down) and
> > > > other inputs setting it to AD7816_FULL.
> > > >
> > > > Fix this by checking it against 0 to correctly check for "full" and
> > > > "power-down", mapping them to AD7816_FULL and AD7816_PD respectively.
> > > >
> > > > Fixes: 7924425db04a ("staging: iio: adc: new driver for AD7816 devices")
> > > > Cc: stable@...r.kernel.org
> > > > Signed-off-by: Gabriel Shahrouzi <gshahrouzi@...il.com>
> > > > ---
> > >
> > > LGTM, do you happen to have this device? It would more interesting to move this
> > > driver out of staging :)
> > Unfortunately, I do not have this device. However, I would still be
> > interested in contributing if possible. I was looking over
> > https://lore.kernel.org/all/20230716144024.30ded663@jic23-huawei/T/
> > where the goal seemed to be to modernize it by replacing the sysfs
> > interface with the iio channel. I also looked through the datasheet
> > and it seemed to be missing some stuff like a channel that can be
> > selected.
> > >
> > > Acked-by: Nuno Sá <nuno.sa@...log.com>
> Applied to the fixes-togreg branch of iio.git but amended the patch title
> to start wit
> staging: iio: adc: ad7816:
>
> so people looking at a short log can see what it is touching.
That makes sense — it's clearer for anyone skimming the short log to
see what it's touching. Appreciate the correction.
>
> Thanks,
>
> Jonathan
>
> > >
> > > > Changes since v3:
> > > >       - Tag stable@...r.kernel.org instead of an email CC
> > > >       - Use the correct version for patch
> > > > Changes since v2:
> > > >       - Add fixes tag that references commit that introduced the bug.
> > > >         - Replace sysfs_streq with strcmp.
> > > > ---
> > > >  drivers/staging/iio/adc/ad7816.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/staging/iio/adc/ad7816.c
> > > > b/drivers/staging/iio/adc/ad7816.c
> > > > index 6c14d7bcdd675..081b17f498638 100644
> > > > --- a/drivers/staging/iio/adc/ad7816.c
> > > > +++ b/drivers/staging/iio/adc/ad7816.c
> > > > @@ -136,7 +136,7 @@ static ssize_t ad7816_store_mode(struct device *dev,
> > > >       struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> > > >       struct ad7816_chip_info *chip = iio_priv(indio_dev);
> > > >
> > > > -     if (strcmp(buf, "full")) {
> > > > +     if (strcmp(buf, "full") == 0) {
> > > >               gpiod_set_value(chip->rdwr_pin, 1);
> > > >               chip->mode = AD7816_FULL;
> > > >       } else {
> >
>