Re: [PATCH 6/8] ACPI: platform_profile: Only remove group when no more handler registered

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Fri, 25 Oct 2024, Mario Limonciello wrote:

> As multiple handlers may register for ACPI platform profile handler,
> only remove the sysfs group when the last one unregisters.
> 
> Tested-by: Matthew Schwartz <matthew.schwartz@linux.dev>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>  drivers/acpi/platform_profile.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 81928adccfade..091ca6941a925 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -23,6 +23,15 @@ static const char * const profile_names[] = {
>  };
>  static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
>  
> +static bool platform_profile_is_registered(void)
> +{
> +	struct list_head *pos;
> +	int count = 0;
> +	list_for_each(pos, &platform_profile_handler_list)
> +		count++;
> +	return count > 0;

return !list_empty(&platform_profile_handler_list) ?

> +}
> +
>  static ssize_t platform_profile_choices_show(struct device *dev,
>  					struct device_attribute *attr,
>  					char *buf)
> @@ -206,8 +215,10 @@ int platform_profile_remove(struct platform_profile_handler *pprof)
>  
>  	list_del(&pprof->list);
>  
> -	sysfs_remove_group(acpi_kobj, &platform_profile_group);
>  	cur_profile = NULL;
> +	if (!platform_profile_is_registered())
> +		sysfs_remove_group(acpi_kobj, &platform_profile_group);
> +
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(platform_profile_remove);
> 

-- 
 i.