thermal: cpu_cooling: Remove cpu_dev update on policy CPU update

It was initially understood that an update to the cpu_device
(cached in cpufreq_cooling_device) was required to ascertain the
correct operating point of the device on a cpufreq policy->cpu update
or creation or deletion of a cpufreq policy.
(e.g. when the existing policy CPU goes offline).

This update is not required and it is possible to ascertain the OPPs
from the leading CPU in a cpufreq domain even if the CPU is hotplugged out.

Fixes: e0128d8ab423 ("thermal: cpu_cooling: implement the power cooling device API")
Acked-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Kapileshwar Singh <kapileshwar.singh@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/cpu_cooling.c

@@ -199,39 +199,6 @@ unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
 }
 EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level);
 
-static void update_cpu_device(int cpu)
-{
-	struct cpufreq_cooling_device *cpufreq_dev;
-
-	mutex_lock(&cooling_cpufreq_lock);
-	list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
-		if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) {
-			cpufreq_dev->cpu_dev = get_cpu_device(cpu);
-			if (!cpufreq_dev->cpu_dev) {
-				dev_warn(&cpufreq_dev->cool_dev->device,
-					"No cpu device for new policy cpu %d\n",
-					 cpu);
-			}
-			break;
-		}
-	}
-	mutex_unlock(&cooling_cpufreq_lock);
-}
-
-static void remove_cpu_device(int cpu)
-{
-	struct cpufreq_cooling_device *cpufreq_dev;
-
-	mutex_lock(&cooling_cpufreq_lock);
-	list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
-		if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) {
-			cpufreq_dev->cpu_dev = NULL;
-			break;
-		}
-	}
-	mutex_unlock(&cooling_cpufreq_lock);
-}
-
 /**
  * cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
  * @nb:	struct notifier_block * with callback info.
@@ -268,13 +235,6 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
 		}
 		mutex_unlock(&cooling_cpufreq_lock);
 		break;
-
-	case CPUFREQ_CREATE_POLICY:
-		update_cpu_device(policy->cpu);
-		break;
-	case CPUFREQ_REMOVE_POLICY:
-		remove_cpu_device(policy->cpu);
-		break;
 	default:
 		return NOTIFY_DONE;
 	}