thermal: sysfs: Rework the handling of trip point updates

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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@intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>

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This commit is contained in:

Rafael J. Wysocki 2023-12-05 13:24:08 +01:00

parent 5973024164

commit be0a3600aa

4 changed files with 47 additions and 56 deletions

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2

drivers/thermal/thermal_core.h

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52

drivers/thermal/thermal_sysfs.c

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45

drivers/thermal/thermal_trip.c

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4

include/linux/thermal.h

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