Re: [PATCH v16 14/32] v4l: async: Introduce helpers for calling async ops callbacks

[Sebastian Reichel <sre@xxxxxxxxxx>]

Hi,

On Thu, Oct 26, 2017 at 10:53:24AM +0300, Sakari Ailus wrote:
> Add three helper functions to call async operations callbacks. Besides
> simplifying callbacks, this allows async notifiers to have no ops set,
> i.e. it can be left NULL.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Acked-by: Pavel Machek <pavel@xxxxxx>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>

-- Sebastian

>  drivers/media/v4l2-core/v4l2-async.c | 56 +++++++++++++++++++++++++-----------
>  1 file changed, 39 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index 9d6fc5f25619..e170682dae78 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -25,6 +25,34 @@
>  #include <media/v4l2-fwnode.h>
>  #include <media/v4l2-subdev.h>
>  
> +static int v4l2_async_notifier_call_bound(struct v4l2_async_notifier *n,
> +					  struct v4l2_subdev *subdev,
> +					  struct v4l2_async_subdev *asd)
> +{
> +	if (!n->ops || !n->ops->bound)
> +		return 0;
> +
> +	return n->ops->bound(n, subdev, asd);
> +}
> +
> +static void v4l2_async_notifier_call_unbind(struct v4l2_async_notifier *n,
> +					    struct v4l2_subdev *subdev,
> +					    struct v4l2_async_subdev *asd)
> +{
> +	if (!n->ops || !n->ops->unbind)
> +		return;
> +
> +	n->ops->unbind(n, subdev, asd);
> +}
> +
> +static int v4l2_async_notifier_call_complete(struct v4l2_async_notifier *n)
> +{
> +	if (!n->ops || !n->ops->complete)
> +		return 0;
> +
> +	return n->ops->complete(n);
> +}
> +
>  static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
>  {
>  #if IS_ENABLED(CONFIG_I2C)
> @@ -102,16 +130,13 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
>  {
>  	int ret;
>  
> -	if (notifier->ops->bound) {
> -		ret = notifier->ops->bound(notifier, sd, asd);
> -		if (ret < 0)
> -			return ret;
> -	}
> +	ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
> +	if (ret < 0)
> +		return ret;
>  
>  	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
>  	if (ret < 0) {
> -		if (notifier->ops->unbind)
> -			notifier->ops->unbind(notifier, sd, asd);
> +		v4l2_async_notifier_call_unbind(notifier, sd, asd);
>  		return ret;
>  	}
>  
> @@ -140,8 +165,7 @@ static void v4l2_async_notifier_unbind_all_subdevs(
>  	struct v4l2_subdev *sd, *tmp;
>  
>  	list_for_each_entry_safe(sd, tmp, &notifier->done, async_list) {
> -		if (notifier->ops->unbind)
> -			notifier->ops->unbind(notifier, sd, sd->asd);
> +		v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
>  		v4l2_async_cleanup(sd);
>  
>  		list_move(&sd->async_list, &subdev_list);
> @@ -198,8 +222,8 @@ int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
>  		}
>  	}
>  
> -	if (list_empty(&notifier->waiting) && notifier->ops->complete) {
> -		ret = notifier->ops->complete(notifier);
> +	if (list_empty(&notifier->waiting)) {
> +		ret = v4l2_async_notifier_call_complete(notifier);
>  		if (ret)
>  			goto err_complete;
>  	}
> @@ -296,10 +320,10 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
>  		if (ret)
>  			goto err_unlock;
>  
> -		if (!list_empty(&notifier->waiting) || !notifier->ops->complete)
> +		if (!list_empty(&notifier->waiting))
>  			goto out_unlock;
>  
> -		ret = notifier->ops->complete(notifier);
> +		ret = v4l2_async_notifier_call_complete(notifier);
>  		if (ret)
>  			goto err_cleanup;
>  
> @@ -315,8 +339,7 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
>  	return 0;
>  
>  err_cleanup:
> -	if (notifier->ops->unbind)
> -		notifier->ops->unbind(notifier, sd, sd->asd);
> +	v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
>  	v4l2_async_cleanup(sd);
>  
>  err_unlock:
> @@ -335,8 +358,7 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
>  
>  		list_add(&sd->asd->list, &notifier->waiting);
>  
> -		if (notifier->ops->unbind)
> -			notifier->ops->unbind(notifier, sd, sd->asd);
> +		v4l2_async_notifier_call_unbind(notifier, sd, sd->asd);
>  	}
>  
>  	v4l2_async_cleanup(sd);
> -- 
> 2.11.0
>

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