linux-kernel - Re: [PATCH v4 06/20] ACPI: platform_profile: Move matching string for new profile out of mutex

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Message-ID: <47780252-0d09-ec4a-9e4b-924939e0df4a@linux.intel.com>
Date: Tue, 5 Nov 2024 17:38:50 +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 v4 06/20] ACPI: platform_profile: Move matching string
 for new profile out of mutex

On Tue, 5 Nov 2024, Mario Limonciello wrote:

> Holding the mutex is not necessary while scanning the string passed into
> platform_profile_store().
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/acpi/platform_profile.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 4e8a155589c21..70e7f1ba68676 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -83,6 +83,11 @@ static ssize_t platform_profile_store(struct device *dev,
>  {
>  	int err, i;
>  
> +	/* Scan for a matching profile */
> +	i = sysfs_match_string(profile_names, buf);
> +	if (i < 0)
> +		return -EINVAL;
> +
>  	err = mutex_lock_interruptible(&profile_lock);
>  	if (err)
>  		return err;
> @@ -92,13 +97,6 @@ static ssize_t platform_profile_store(struct device *dev,
>  		return -ENODEV;
>  	}
>  
> -	/* Scan for a matching profile */
> -	i = sysfs_match_string(profile_names, buf);
> -	if (i < 0) {
> -		mutex_unlock(&profile_lock);
> -		return -EINVAL;
> -	}
> -
>  	/* Check that platform supports this profile choice */
>  	if (!test_bit(i, cur_profile->choices)) {
>  		mutex_unlock(&profile_lock);
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>


-- 
 i.