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

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Message-ID: <2816f1b2-b6ea-05eb-f2ce-a0c07093f146@linux.intel.com>
Date: Tue, 29 Oct 2024 12:06:33 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
cc: Hans de Goede <hdegoede@...hat.com>, 
    "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
    Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>, 
    Shyam Sundar S K <Shyam-sundar.S-k@....com>, 
    Corentin Chary <corentin.chary@...il.com>, 
    "Luke D . Jones" <luke@...nes.dev>, Ike Panhc <ike.pan@...onical.com>, 
    Henrique de Moraes Holschuh <hmh@....eng.br>, 
    Alexis Belmonte <alexbelm48@...il.com>, 
    Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
    Ai Chao <aichao@...inos.cn>, Gergo Koteles <soyer@....hu>, 
    open list <linux-kernel@...r.kernel.org>, 
    "open list:ACPI" <linux-acpi@...r.kernel.org>, 
    "open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER" <platform-driver-x86@...r.kernel.org>, 
    "open list:THINKPAD ACPI EXTRAS DRIVER" <ibm-acpi-devel@...ts.sourceforge.net>, 
    Mark Pearson <mpearson-lenovo@...ebb.ca>, 
    Matthew Schwartz <matthew.schwartz@...ux.dev>
Subject: Re: [PATCH 6/8] ACPI: platform_profile: Only remove group when no
 more handler registered

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@...ux.dev>
> Signed-off-by: Mario Limonciello <mario.limonciello@....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.