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

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Message-ID: <CAJZ5v0gyX-G+bsYkp01-LbCHU4dAo_W2gYx7df8bGtp9aT5a0w@mail.gmail.com>
Date:   Thu, 10 Nov 2022 15:14:00 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        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 Thu, Nov 10, 2022 at 3:12 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Thu, Nov 10, 2022 at 02:01:49PM +0100, Rafael J. Wysocki wrote:
> > On Thu, Nov 10, 2022 at 1:25 AM Guenter Roeck <linux@...ck-us.net> wrote:
> > >
> > > 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);
> > > }
> >
> > Thanks for the explanation.
> >
> > > Should I phrase or explain it differently ?
> >
> > I would rather say "bare" or something like that so it is all clear to
> > people like me, but it is your call.
>
> I updated the commit description to use "must be called with thermal
> device mutex held". I kept 'locked' in the subject; I don't think using
> 'bare' there would add any clarity. Hope that is ok.

It is.