linux-kernel - Re: [PATCH AUTOSEL 5.4 074/350] iio: proximity: sx9500: fix iio_triggered_buffer

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Message-ID: <20191215155247.66ea5412@archlinux>
Date:   Sun, 15 Dec 2019 15:52:47 +0000
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.4 074/350] iio: proximity: sx9500: fix
 iio_triggered_buffer_{predisable,postenable} positions

On Tue, 10 Dec 2019 16:02:59 -0500
Sasha Levin <sashal@...nel.org> wrote:

> From: Alexandru Ardelean <alexandru.ardelean@...log.com>
> 
> [ Upstream commit 3cfd6464fe23deb45bb688df66184b3f32fefc16 ]
> 
> The iio_triggered_buffer_predisable() should be called last, to detach the
> poll func after the devices has been suspended.
> 
> This change re-organizes things a bit so that the postenable & predisable
> are symmetrical. It also converts the preenable() to a postenable().
> 
> Not stable material as there is no known problem with the current
> code, it's just not consistent with the form we would like all the
> IIO drivers to adopt so as to allow subsystem wide changes.

See comment.

Jonathan

> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/iio/proximity/sx9500.c | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c
> index 612f79c53cfc6..287d288e40c27 100644
> --- a/drivers/iio/proximity/sx9500.c
> +++ b/drivers/iio/proximity/sx9500.c
> @@ -675,11 +675,15 @@ static irqreturn_t sx9500_trigger_handler(int irq, void *private)
>  	return IRQ_HANDLED;
>  }
>  
> -static int sx9500_buffer_preenable(struct iio_dev *indio_dev)
> +static int sx9500_buffer_postenable(struct iio_dev *indio_dev)
>  {
>  	struct sx9500_data *data = iio_priv(indio_dev);
>  	int ret = 0, i;
>  
> +	ret = iio_triggered_buffer_postenable(indio_dev);
> +	if (ret)
> +		return ret;
> +
>  	mutex_lock(&data->mutex);
>  
>  	for (i = 0; i < SX9500_NUM_CHANNELS; i++)
> @@ -696,6 +700,9 @@ static int sx9500_buffer_preenable(struct iio_dev *indio_dev)
>  
>  	mutex_unlock(&data->mutex);
>  
> +	if (ret)
> +		iio_triggered_buffer_predisable(indio_dev);
> +
>  	return ret;
>  }
>  
> @@ -704,8 +711,6 @@ static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
>  	struct sx9500_data *data = iio_priv(indio_dev);
>  	int ret = 0, i;
>  
> -	iio_triggered_buffer_predisable(indio_dev);
> -
>  	mutex_lock(&data->mutex);
>  
>  	for (i = 0; i < SX9500_NUM_CHANNELS; i++)
> @@ -722,12 +727,13 @@ static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
>  
>  	mutex_unlock(&data->mutex);
>  
> +	iio_triggered_buffer_predisable(indio_dev);
> +
>  	return ret;
>  }
>  
>  static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = {
> -	.preenable = sx9500_buffer_preenable,
> -	.postenable = iio_triggered_buffer_postenable,
> +	.postenable = sx9500_buffer_postenable,
>  	.predisable = sx9500_buffer_predisable,
>  };
>