linux-kernel - Re: [PATCH v4 1/2] thermal: sysfs: Rework the handling of trip point updates

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Date:   Wed, 6 Dec 2023 12:33:03 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lukasz Luba <lukasz.luba@....com>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v4 1/2] thermal: sysfs: Rework the handling of trip point
 updates

On 05/12/2023 13:24, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Both trip_point_temp_store() and trip_point_hyst_store() use
> thermal_zone_set_trip() to update a given trip point, but none of them
> actually needs to change more than one field in struct thermal_trip
> representing it.  However, each of them effectively calls
> __thermal_zone_get_trip() twice in a row for the same trip index value,
> once directly and once via thermal_zone_set_trip(), which is not
> particularly efficient, and the way in which thermal_zone_set_trip()
> carries out the update is not particularly straightforward.
> 
> Moreover, input processing need not be done under the thermal zone lock
> in any of these functions.
> 
> Rework trip_point_temp_store() and trip_point_hyst_store() to address
> the above, move the part of thermal_zone_set_trip() that is still
> useful to a new function called thermal_zone_trip_updated() and drop
> the rest of it.
> 
> While at it, make trip_point_hyst_store() reject negative hysteresis
> values.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>





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