diff mbox series

[v2,1/8] iio: proximity: ping: pass reference to IIO device via call-stack

Message ID 20200514131710.84201-2-alexandru.ardelean@analog.com (mailing list archive)
State New, archived
Headers show
Series iio: core: wrap IIO device into an iio_dev_opaque object | expand

Commit Message

Alexandru Ardelean May 14, 2020, 1:17 p.m. UTC
Since there will be some changes to how iio_priv_to_dev() is implemented,
it could be that the helper becomes a bit slower, as it will be hidden away
in the IIO core.

For this driver, the IIO device can be passed directly as a parameter to
the ping_read() function, thus making it immune to the change of
iio_priv_to_dev().

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/proximity/ping.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Comments

Jonathan Cameron May 16, 2020, 5:12 p.m. UTC | #1
On Thu, 14 May 2020 16:17:03 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:

> Since there will be some changes to how iio_priv_to_dev() is implemented,
> it could be that the helper becomes a bit slower, as it will be hidden away
> in the IIO core.
> 
> For this driver, the IIO device can be passed directly as a parameter to
> the ping_read() function, thus making it immune to the change of
> iio_priv_to_dev().
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Patch makes sense and I should have spotted this one during original
review :( Going backwards and forwards is never a good idea even without
the rework you have.

But... (you knew that was coming :), there is no need to pass
data to the the read function.  It is the structure returned by
iio_priv() and not used anywhere else in the read_raw callback.
So might as well just pass the iio_dev and get the data structure
with in the read function via iio_priv(indio_dev)

Thanks,

J

> ---
>  drivers/iio/proximity/ping.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/proximity/ping.c b/drivers/iio/proximity/ping.c
> index 12b893c5b0ee..ddc43a5a2ef8 100644
> --- a/drivers/iio/proximity/ping.c
> +++ b/drivers/iio/proximity/ping.c
> @@ -89,14 +89,13 @@ static irqreturn_t ping_handle_irq(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static int ping_read(struct ping_data *data)
> +static int ping_read(struct iio_dev *indio_dev, struct ping_data *data)
>  {
>  	int ret;
>  	ktime_t ktime_dt;
>  	s64 dt_ns;
>  	u32 time_ns, distance_mm;
>  	struct platform_device *pdev = to_platform_device(data->dev);
> -	struct iio_dev *indio_dev = iio_priv_to_dev(data);
>  
>  	/*
>  	 * just one read-echo-cycle can take place at a time
> @@ -236,7 +235,7 @@ static int ping_read_raw(struct iio_dev *indio_dev,
>  
>  	switch (info) {
>  	case IIO_CHAN_INFO_RAW:
> -		ret = ping_read(data);
> +		ret = ping_read(indio_dev, data);
>  		if (ret < 0)
>  			return ret;
>  		*val = ret;
diff mbox series

Patch

diff --git a/drivers/iio/proximity/ping.c b/drivers/iio/proximity/ping.c
index 12b893c5b0ee..ddc43a5a2ef8 100644
--- a/drivers/iio/proximity/ping.c
+++ b/drivers/iio/proximity/ping.c
@@ -89,14 +89,13 @@  static irqreturn_t ping_handle_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int ping_read(struct ping_data *data)
+static int ping_read(struct iio_dev *indio_dev, struct ping_data *data)
 {
 	int ret;
 	ktime_t ktime_dt;
 	s64 dt_ns;
 	u32 time_ns, distance_mm;
 	struct platform_device *pdev = to_platform_device(data->dev);
-	struct iio_dev *indio_dev = iio_priv_to_dev(data);
 
 	/*
 	 * just one read-echo-cycle can take place at a time
@@ -236,7 +235,7 @@  static int ping_read_raw(struct iio_dev *indio_dev,
 
 	switch (info) {
 	case IIO_CHAN_INFO_RAW:
-		ret = ping_read(data);
+		ret = ping_read(indio_dev, data);
 		if (ret < 0)
 			return ret;
 		*val = ret;