Re: [PATCH v1 3/4] devres: Add devm_remove_action_optional() helper

[Raag Jadav]

On Thu, Feb 20, 2025 at 03:44:59PM +0200, Andy Shevchenko wrote:
> Add a new helper to remove an action that was added via devm_add_action()
> family of calls, but not warn in the cases where action wasn't found since
> it is optional and wasn't even added.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
>  include/linux/device/devres.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/include/linux/device/devres.h b/include/linux/device/devres.h
> index ae696d10faff..4daebbf7f227 100644
> --- a/include/linux/device/devres.h
> +++ b/include/linux/device/devres.h
> @@ -145,6 +145,19 @@ void devm_remove_action(struct device *dev, void (*action)(void *), void *data)
>  	WARN_ON(devm_remove_action_nowarn(dev, action, data));
>  }
>  
> +/* Same as devm_remove_action(), but doesn't WARN() if action wasn't added before */
> +static inline
> +void devm_remove_action_optional(struct device *dev, void (*action)(void *), void *data)
> +{
> +	int ret;
> +
> +	ret = devm_remove_action_nowarn(dev, action, data);
> +	if (ret == -ENOENT)
> +		return;
> +
> +	WARN_ON(ret);
> +}

Trying to wrap my head around this one, can't the user simply do

	if (devm_is_action_added())
		devm_remove_action/_nowarn();

Raag