On 08/12/2023 20:19, Rafael J. Wysocki wrote:
From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Multiple places in the thermal subsystem (most importantly, sysfs
attribute callback functions) check if the given thermal zone device is
still registered in order to return early in case the device_del() in
thermal_zone_device_unregister() has run already.
However, after thermal_zone_device_unregister() has been made wait for
all of the zone-related activity to complete before returning, it is
not necessary to do that any more, because all of the code holding a
reference to the thermal zone device object will be waited for even if
it does not do anything special to enforce this.
Accordingly, drop all of the device_is_registered() checks that are now
redundant and get rid of the zone locking that is not necessary any more
after dropping them.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
[ ... ]
@@ -132,11 +120,6 @@ trip_point_temp_store(struct device *dev
mutex_lock(&tz->lock);
- if (!device_is_registered(dev)) {
- ret = -ENODEV;
- goto unlock;
- }
-
trip = &tz->trips[trip_id];
if (temp != trip->temperature) {
@@ -162,23 +145,12 @@ trip_point_temp_show(struct device *dev,
char *buf)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
- int trip_id, temp;
+ int trip_id;
if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
return -EINVAL;
- mutex_lock(&tz->lock);
-
- if (!device_is_registered(dev)) {
- mutex_unlock(&tz->lock);
- return -ENODEV;
- }
-
- temp = tz->trips[trip_id].temperature;
-
- mutex_unlock(&tz->lock);
-
- return sprintf(buf, "%d\n", temp);
+ return sprintf(buf, "%d\n", tz->trips[trip_id].temperature);
Without the lock, could the trip_temp_store() make the value change
while we read it?
[ ... ]
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