linux-kernel - Re: [PATCH v2] iio: potentiostat: lmp9100: fix iio_triggered_buffer

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Date:   Sat, 7 Mar 2020 15:25:31 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Matt Ranostay <mranostay@...il.com>
Cc:     Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        matt.ranostay@...sulko.com
Subject: Re: [PATCH v2] iio: potentiostat: lmp9100: fix
 iio_triggered_buffer_{predisable,postenable} positions

On Wed, 4 Mar 2020 13:17:36 -0800
Matt Ranostay <mranostay@...il.com> wrote:

> On Wed, Mar 4, 2020 at 1:38 AM Alexandru Ardelean
> <alexandru.ardelean@...log.com> wrote:
> >
> > The iio_triggered_buffer_{predisable,postenable} functions attach/detach
> > the poll functions.
> >
> > For the predisable hook, the disable code should occur before detaching
> > the poll func, and for the postenable hook, the poll func should be
> > attached before the enable code.
> >
> > The lmp9100 was attaching a poll function but never detaching it via any
> > IIO disable hook.
> >
> > This change adds the detaching of the poll function, and moves/renames
> > lmp91000_buffer_preenable() function to lmp91000_buffer_postenable().
> > The idea is to make it more symmetrical, so that when the
> > iio_triggered_buffer_{predisable,postenable} functions get removed, it's
> > easier to see.
> >
> > Fixes: 67e17300dc1d7 ("iio: potentiostat: add LMP91000 support")
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>  
> 
> Acked-by: Matt Ranostay <matt.ranostay@...sulko.com>

I'm not going to rush this one in as it's been like this for a while

Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it,

Thanks,

Jonathan

> 
> > ---
> >
> > Changelog v1 -> v2:
> > * forgot to call iio_triggered_buffer_postenable() in
> >   lmp91000_buffer_postenable() in v1
> >
> >  drivers/iio/potentiostat/lmp91000.c | 18 +++++++++++++-----
> >  1 file changed, 13 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/iio/potentiostat/lmp91000.c b/drivers/iio/potentiostat/lmp91000.c
> > index a0e5f530faa9..2cb11da18e0f 100644
> > --- a/drivers/iio/potentiostat/lmp91000.c
> > +++ b/drivers/iio/potentiostat/lmp91000.c
> > @@ -275,11 +275,20 @@ static int lmp91000_buffer_cb(const void *val, void *private)
> >  static const struct iio_trigger_ops lmp91000_trigger_ops = {
> >  };
> >
> > -static int lmp91000_buffer_preenable(struct iio_dev *indio_dev)
> > +static int lmp91000_buffer_postenable(struct iio_dev *indio_dev)
> >  {
> >         struct lmp91000_data *data = iio_priv(indio_dev);
> > +       int err;
> >
> > -       return iio_channel_start_all_cb(data->cb_buffer);
> > +       err = iio_triggered_buffer_postenable(indio_dev);
> > +       if (err)
> > +               return err;
> > +
> > +       err = iio_channel_start_all_cb(data->cb_buffer);
> > +       if (err)
> > +               iio_triggered_buffer_predisable(indio_dev);
> > +
> > +       return err;
> >  }
> >
> >  static int lmp91000_buffer_predisable(struct iio_dev *indio_dev)
> > @@ -288,12 +297,11 @@ static int lmp91000_buffer_predisable(struct iio_dev *indio_dev)
> >
> >         iio_channel_stop_all_cb(data->cb_buffer);
> >
> > -       return 0;
> > +       return iio_triggered_buffer_predisable(indio_dev);
> >  }
> >
> >  static const struct iio_buffer_setup_ops lmp91000_buffer_setup_ops = {
> > -       .preenable = lmp91000_buffer_preenable,
> > -       .postenable = iio_triggered_buffer_postenable,
> > +       .postenable = lmp91000_buffer_postenable,
> >         .predisable = lmp91000_buffer_predisable,
> >  };
> >
> > --
> > 2.20.1
> >