linux-kernel - [PATCH v1 0/3] thermal: core: Remove thermal zones during unregistration

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Message-ID: <1880915.tdWV9SEqCh@kreacher>
Date:   Fri, 08 Dec 2023 20:11:51 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lukasz Luba <lukasz.luba@....com>
Subject: [PATCH v1 0/3] thermal: core: Remove thermal zones during unregistration

Hi All,

This patch series adds a mechanism to guarantee that
thermal_zone_device_unregister() will not return until all of the active
references to the thermal zone device object in question have been dropped
and it has been deleted (patch [1/3]).

This supersedes the approach used so far in which all thermal zone sysfs
attribute callbacks check if the zone device is still registered under the
zone lock, so as to return early if that is not the case, as it means that
device_del() has been called for the thermal zone in question (and returned).
It is not necessary to do that any more after patch [1/3], so patch [2/3]
removes those checks from the code and drops zone locking that is not
necessary any more either.

Patch [3/3] uses the observation that the thermal subsystem does not need to
check if a thermal zone device is registered at all, because it can use its
own data to determine whether or not the thermal zone is going away and so
it may not be worth updating it, for example.

Please refer to the patch changelogs for details.

The series depends on new thermal material in linux-next, but it should not
substantially depend on any changes that have not made it into linux-next yet.

Thanks!