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

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Date:   Wed, 4 Mar 2020 13:17:36 -0800
From:   Matt Ranostay <mranostay@...il.com>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Cameron <jic23@...nel.org>, matt.ranostay@...sulko.com
Subject: Re: [PATCH v2] iio: potentiostat: lmp9100: fix iio_triggered_buffer_{predisable,postenable}
 positions

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>

> ---
>
> 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
>