linux-kernel - Re: [PATCH 5/9] thermal/core: Introduce locked version of thermal_zone_device

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Message-ID: <20221110002549.GA3550654@roeck-us.net>
Date:   Wed, 9 Nov 2022 16:25:49 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] thermal/core: Introduce locked version of
 thermal_zone_device_update

On Wed, Nov 09, 2022 at 08:15:17PM +0100, Rafael J. Wysocki wrote:
> On Mon, Oct 17, 2022 at 3:09 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >
> > In thermal_zone_device_set_mode(), the thermal zone mutex is released only
> > to be reacquired in the subsequent call to thermal_zone_device_update().
> >
> > Introduce __thermal_zone_device_update() as locked version of
> 
> Did you mean "unlocked"?
> 
No, I did mean "locked", as in "must be called with thermal zone device
mutex acquired".

locked:

void __thermal_zone_device_update(struct thermal_zone_device *tz,
                                  enum thermal_notify_event event)
{
	...
}

unlocked:

void thermal_zone_device_update(struct thermal_zone_device *tz,
                                enum thermal_notify_event event)
{
        mutex_lock(&tz->lock);
        if (device_is_registered(&tz->device))
                __thermal_zone_device_update(tz, event);
        mutex_unlock(&tz->lock);
}

Should I phrase or explain it differently ?

Thanks,
Guenter