Re: [PATCH v3 07/22] ACPI: platform_profile: Use guard(mutex) for register/unregister

[Ilpo Järvinen]

On Wed, 30 Oct 2024, Mario Limonciello wrote:

> guard(mutex) can be used to automatically release mutexes when going
> out of scope.
> 
> Tested-by: Matthew Schwartz <matthew.schwartz@xxxxxxxxx>
> Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> Reviewed-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> ---
>  drivers/acpi/platform_profile.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index f2f2274e4d83e..cc2037147c0fd 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -191,34 +191,29 @@ int platform_profile_register(struct platform_profile_handler *pprof)
>  		return -EINVAL;
>  	}
>  
> -	mutex_lock(&profile_lock);
> +	guard(mutex)(&profile_lock);
>  	/* We can only have one active profile */
> -	if (cur_profile) {
> -		mutex_unlock(&profile_lock);
> +	if (cur_profile)
>  		return -EEXIST;
> -	}
>  
>  	err = sysfs_create_group(acpi_kobj, &platform_profile_group);
> -	if (err) {
> -		mutex_unlock(&profile_lock);
> +	if (err)
>  		return err;
> -	}
>  	list_add_tail(&pprof->list, &platform_profile_handler_list);
>  
>  	cur_profile = pprof;
> -	mutex_unlock(&profile_lock);
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(platform_profile_register);
>  
>  int platform_profile_remove(struct platform_profile_handler *pprof)
>  {
> +	guard(mutex)(&profile_lock);
> +
>  	list_del(&pprof->list);
>  
>  	sysfs_remove_group(acpi_kobj, &platform_profile_group);
> -	mutex_lock(&profile_lock);
>  	cur_profile = NULL;
> -	mutex_unlock(&profile_lock);
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(platform_profile_remove);
> 

For patches 1-7,

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

-- 
 i.