[PATCH] thermal: change thermal_class to a const struct

[Jori Koolstra]

The class_create() call has been deprecated in favor of class_register()
as the driver core now allows for a struct class to be in read-only
memory. Change thermal_class to be a const struct class and drop the
class_create() call.

Compile tested only.

Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jori Koolstra <jkoolstra@xxxxxxxxx>
---
 drivers/thermal/thermal_core.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 28a20d4b475c..36220113ca8e 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -889,7 +889,9 @@ static void thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz,
 	kfree(pos);
 }
 
-static struct class *thermal_class __ro_after_init;
+static const struct class thermal_class = {
+	.name	= "thermal"
+};
 
 static inline
 void print_bind_err_msg(struct thermal_zone_device *tz,
@@ -973,7 +975,7 @@ thermal_cooling_device_alloc(const char *type, const struct thermal_cooling_devi
 	    !ops->set_cur_state)
 		return ERR_PTR(-EINVAL);
 
-	if (!thermal_class)
+	if (!class_is_registered(&thermal_class))
 		return ERR_PTR(-ENODEV);
 
 	cdev = kzalloc_obj(*cdev);
@@ -1010,7 +1012,7 @@ int thermal_cooling_device_add(struct thermal_cooling_device *cdev, void *devdat
 	mutex_init(&cdev->lock);
 	INIT_LIST_HEAD(&cdev->thermal_instances);
 	cdev->updated = false;
-	cdev->device.class = thermal_class;
+	cdev->device.class = &thermal_class;
 	cdev->device.release = thermal_cdev_release;
 	device_initialize(&cdev->device);
 	cdev->devdata = devdata;
@@ -1447,7 +1449,7 @@ thermal_zone_device_register_with_trips(const char *type,
 	if (polling_delay && passive_delay > polling_delay)
 		return ERR_PTR(-EINVAL);
 
-	if (!thermal_class)
+	if (!class_is_registered(&thermal_class))
 		return ERR_PTR(-ENODEV);
 
 	tz = kzalloc_flex(*tz, trips, num_trips);
@@ -1483,7 +1485,7 @@ thermal_zone_device_register_with_trips(const char *type,
 	if (!tz->ops.critical)
 		tz->ops.critical = thermal_zone_device_critical;
 
-	tz->device.class = thermal_class;
+	tz->device.class = &thermal_class;
 	tz->device.release = thermal_zone_device_release;
 	tz->devdata = devdata;
 	tz->num_trips = num_trips;
@@ -1745,7 +1747,7 @@ static void __thermal_pm_prepare(void)
 
 void thermal_pm_prepare(void)
 {
-	if (!thermal_class)
+	if (!class_is_registered(&thermal_class))
 		return;
 
 	__thermal_pm_prepare();
@@ -1776,7 +1778,7 @@ void thermal_pm_complete(void)
 {
 	struct thermal_zone_device *tz;
 
-	if (!thermal_class)
+	if (!class_is_registered(&thermal_class))
 		return;
 
 	guard(mutex)(&thermal_list_lock);
@@ -1789,7 +1791,6 @@ void thermal_pm_complete(void)
 
 static int __init thermal_init(void)
 {
-	struct class *tc;
 	int result;
 
 	thermal_debug_init();
@@ -1808,13 +1809,10 @@ static int __init thermal_init(void)
 	if (result)
 		goto unregister_governors;
 
-	tc = class_create("thermal");
-	if (IS_ERR(tc)) {
-		result = PTR_ERR(tc);
+	result = class_register(&thermal_class);
+	if (result)
 		goto unregister_governors;
-	}
 
-	thermal_class = tc;
 	return 0;
 
 unregister_governors:
-- 
2.55.0