[PATCH] iio: proximity: sx9500: fix iio_triggered_buffer_{predisable,postenable} positions

[PATCH] iio: proximity: sx9500: fix iio_triggered_buffer_{predisable,postenable} positions

[Alexandru Ardelean]

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().

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 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 612f79c53cfc..287d288e40c2 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,
 };
 
-- 
2.20.1

Re: [PATCH] iio: proximity: sx9500: fix iio_triggered_buffer_{predisable,postenable} positions

[Jonathan Cameron]

On Fri, 20 Sep 2019 11:35:13 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> 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().
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
This one seems simple and I've not heard from Vlad recently so
applied to the togreg branch of iio.git with a note to try and stop
the stable trees picking it up.

Thanks,

Jonathan

> ---
>  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 612f79c53cfc..287d288e40c2 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,
>  };
>