linux-kernel - Re: [PATCH] iio: hdc100x: fix iio_triggered_buffer

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Date:   Sun, 27 Oct 2019 20:37:45 +0200
From:   Matt Ranostay <matt.ranostay@...sulko.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Alexandru Ardelean <alexandru.ardelean@...log.com>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: hdc100x: fix iio_triggered_buffer_{predisable,postenable}
 positions

On Sun, Oct 27, 2019 at 6:58 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Wed, 23 Oct 2019 11:27:14 +0300
> Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
>
> > The iio_triggered_buffer_postenable() hook should be called first to
> > attach the poll function and the iio_triggered_buffer_predisable() hook
> > should be called last in the predisable hook.
> >
> > This change updates the driver to attach/detach the poll func in the
> > correct order.
> >
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> Seems fine, but should have cc'd Matt and I'd like to give him time
> to take a quick look.
>

Reviewed-by: Matt Ranostay <matt.ranostay@...sulko.com>

> +CC Matt.
>
> Thanks,
>
> Jonathan
>
> > ---
> >  drivers/iio/humidity/hdc100x.c | 19 +++++++++++--------
> >  1 file changed, 11 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/iio/humidity/hdc100x.c b/drivers/iio/humidity/hdc100x.c
> > index bfe1cdb16846..963ff043eecf 100644
> > --- a/drivers/iio/humidity/hdc100x.c
> > +++ b/drivers/iio/humidity/hdc100x.c
> > @@ -278,31 +278,34 @@ static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
> >       struct hdc100x_data *data = iio_priv(indio_dev);
> >       int ret;
> >
> > +     ret = iio_triggered_buffer_postenable(indio_dev);
> > +     if (ret)
> > +             return ret;
> > +
> >       /* Buffer is enabled. First set ACQ Mode, then attach poll func */
> >       mutex_lock(&data->lock);
> >       ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
> >                                   HDC100X_REG_CONFIG_ACQ_MODE);
> >       mutex_unlock(&data->lock);
> >       if (ret)
> > -             return ret;
> > +             iio_triggered_buffer_predisable(indio_dev);
> >
> > -     return iio_triggered_buffer_postenable(indio_dev);
> > +     return ret;
> >  }
> >
> >  static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
> >  {
> >       struct hdc100x_data *data = iio_priv(indio_dev);
> > -     int ret;
> > -
> > -     /* First detach poll func, then reset ACQ mode. OK to disable buffer */
> > -     ret = iio_triggered_buffer_predisable(indio_dev);
> > -     if (ret)
> > -             return ret;
> > +     int ret, ret2;
> >
> >       mutex_lock(&data->lock);
> >       ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
> >       mutex_unlock(&data->lock);
> >
> > +     ret2 = iio_triggered_buffer_predisable(indio_dev);
> > +     if (ret == 0)
> > +             ret = ret2;
> > +
> >       return ret;
> >  }
> >
>