linux-kernel - [PATCH v3 2/2] thermal: sysfs: Rework the reading of trip point attributes

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Message-ID: <4855368.GXAFRqVoOG@kreacher>
Date:   Mon, 04 Dec 2023 15:52:22 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        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: [PATCH v3 2/2] thermal: sysfs: Rework the reading of trip point attributes

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Rework the _show() callback functions for the trip point temperature,
hysteresis and type attributes to avoid copying the values of struct
thermal_trip fields that they do not use and to make them carry out
validation checks with the help of check_thermal_zone_and_trip_id(),
like the corresponding _store() callback functions.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

v2 -> v3: Drop a redundant 'ret' check at the end of trip_point_hyst_show.

v1 -> v2: Do not drop thermal zone locking from the _store() callback functions.

---
 drivers/thermal/thermal_sysfs.c |   55 ++++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 27 deletions(-)

Index: linux-pm/drivers/thermal/thermal_sysfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_sysfs.c
+++ linux-pm/drivers/thermal/thermal_sysfs.c
@@ -96,25 +96,25 @@ trip_point_type_show(struct device *dev,
 		     char *buf)
 {
 	struct thermal_zone_device *tz = to_thermal_zone(dev);
-	struct thermal_trip trip;
-	int trip_id, result;
+	enum thermal_trip_type type;
+	int trip_id, ret;
 
 	if (sscanf(attr->attr.name, "trip_point_%d_type", &trip_id) != 1)
 		return -EINVAL;
 
 	mutex_lock(&tz->lock);
 
-	if (device_is_registered(dev))
-		result = __thermal_zone_get_trip(tz, trip_id, &trip);
-	else
-		result = -ENODEV;
+	ret = check_thermal_zone_and_trip_id(dev, tz, trip_id);
+	if (ret) {
+		mutex_unlock(&tz->lock);
+		return ret;
+	}
 
-	mutex_unlock(&tz->lock);
+	type = tz->trips[trip_id].type;
 
-	if (result)
-		return result;
+	mutex_unlock(&tz->lock);
 
-	switch (trip.type) {
+	switch (type) {
 	case THERMAL_TRIP_CRITICAL:
 		return sprintf(buf, "critical\n");
 	case THERMAL_TRIP_HOT:
@@ -175,25 +175,24 @@ trip_point_temp_show(struct device *dev,
 		     char *buf)
 {
 	struct thermal_zone_device *tz = to_thermal_zone(dev);
-	struct thermal_trip trip;
-	int trip_id, ret;
+	int trip_id, ret, temp;
 
 	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
 		return -EINVAL;
 
 	mutex_lock(&tz->lock);
 
-	if (device_is_registered(dev))
-		ret = __thermal_zone_get_trip(tz, trip_id, &trip);
-	else
-		ret = -ENODEV;
+	ret = check_thermal_zone_and_trip_id(dev, tz, trip_id);
+	if (ret) {
+		mutex_unlock(&tz->lock);
+		return ret;
+	}
 
-	mutex_unlock(&tz->lock);
+	temp = tz->trips[trip_id].temperature;
 
-	if (ret)
-		return ret;
+	mutex_unlock(&tz->lock);
 
-	return sprintf(buf, "%d\n", trip.temperature);
+	return sprintf(buf, "%d\n", temp);
 }
 
 static ssize_t
@@ -243,22 +242,24 @@ trip_point_hyst_show(struct device *dev,
 		     char *buf)
 {
 	struct thermal_zone_device *tz = to_thermal_zone(dev);
-	struct thermal_trip trip;
-	int trip_id, ret;
+	int trip_id, ret, hyst;
 
 	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
 		return -EINVAL;
 
 	mutex_lock(&tz->lock);
 
-	if (device_is_registered(dev))
-		ret = __thermal_zone_get_trip(tz, trip_id, &trip);
-	else
-		ret = -ENODEV;
+	ret = check_thermal_zone_and_trip_id(dev, tz, trip_id);
+	if (ret) {
+		mutex_unlock(&tz->lock);
+		return ret;
+	}
+
+	hyst = tz->trips[trip_id].hysteresis;
 
 	mutex_unlock(&tz->lock);
 
-	return ret ? ret : sprintf(buf, "%d\n", trip.hysteresis);
+	return sprintf(buf, "%d\n", hyst);
 }
 
 static ssize_t