diff options
author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-12-05 15:24:08 +0300 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-12-06 23:29:52 +0300 |
commit | be0a3600aa1ebe9d23243c91d41ab1a2d5091a9b (patch) | |
tree | 68789a51673d9faa01882eccbbdda86891fed228 /drivers/thermal/thermal_sysfs.c | |
parent | 59730241647287c0ab64bf0bc7449308392b7ea4 (diff) | |
download | linux-be0a3600aa1ebe9d23243c91d41ab1a2d5091a9b.tar.xz |
thermal: sysfs: Rework the handling of trip point updates
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>
Diffstat (limited to 'drivers/thermal/thermal_sysfs.c')
-rw-r--r-- | drivers/thermal/thermal_sysfs.c | 52 |
1 files changed, 36 insertions, 16 deletions
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c index eef40d4f3063..06202aa50060 100644 --- a/drivers/thermal/thermal_sysfs.c +++ b/drivers/thermal/thermal_sysfs.c @@ -120,8 +120,13 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct thermal_zone_device *tz = to_thermal_zone(dev); - struct thermal_trip trip; + struct thermal_trip *trip; int trip_id, ret; + int temp; + + ret = kstrtoint(buf, 10, &temp); + if (ret) + return -EINVAL; if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1) return -EINVAL; @@ -133,15 +138,20 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr, goto unlock; } - ret = __thermal_zone_get_trip(tz, trip_id, &trip); - if (ret) - goto unlock; + trip = &tz->trips[trip_id]; - ret = kstrtoint(buf, 10, &trip.temperature); - if (ret) - goto unlock; + if (temp != trip->temperature) { + if (tz->ops->set_trip_temp) { + ret = tz->ops->set_trip_temp(tz, trip_id, temp); + if (ret) + goto unlock; + } + + trip->temperature = temp; + + thermal_zone_trip_updated(tz, trip); + } - ret = thermal_zone_set_trip(tz, trip_id, &trip); unlock: mutex_unlock(&tz->lock); @@ -179,8 +189,13 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct thermal_zone_device *tz = to_thermal_zone(dev); - struct thermal_trip trip; + struct thermal_trip *trip; int trip_id, ret; + int hyst; + + ret = kstrtoint(buf, 10, &hyst); + if (ret || hyst < 0) + return -EINVAL; if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1) return -EINVAL; @@ -192,15 +207,20 @@ trip_point_hyst_store(struct device *dev, struct device_attribute *attr, goto unlock; } - ret = __thermal_zone_get_trip(tz, trip_id, &trip); - if (ret) - goto unlock; + trip = &tz->trips[trip_id]; - ret = kstrtoint(buf, 10, &trip.hysteresis); - if (ret) - goto unlock; + if (hyst != trip->hysteresis) { + if (tz->ops->set_trip_hyst) { + ret = tz->ops->set_trip_hyst(tz, trip_id, hyst); + if (ret) + goto unlock; + } + + trip->hysteresis = hyst; + + thermal_zone_trip_updated(tz, trip); + } - ret = thermal_zone_set_trip(tz, trip_id, &trip); unlock: mutex_unlock(&tz->lock); |