ACPI: processor: idle: Reset power_setup_done flag on initialization failure

The 'power_setup_done' flag is a key indicator used across the ACPI
processor driver to determine if cpuidle are properly configured and
available for a given CPU.

Currently, this flag is set during the early stages of initialization.
However, if the subsequent registration of the cpuidle driver in
acpi_processor_register_idle_driver() or the per-CPU device registration
in acpi_processor_power_init() fails, this flag remains set. This may
lead to some issues where other functions in ACPI idle driver use these
flags.

Fix this by explicitly resetting this flag to 0 in these error paths.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/20260403085343.866440-1-lihuisong@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: LiHuiSong1

drivers/acpi/processor_idle.c

@@ -1379,6 +1379,7 @@ void acpi_processor_register_idle_driver(void)
 
 	ret = cpuidle_register_driver(&acpi_idle_driver);
 	if (ret) {
+		pr->flags.power_setup_done = 0;
 		pr_debug("register %s failed.\n", acpi_idle_driver.name);
 		return;
 	}
@@ -1387,7 +1388,16 @@ void acpi_processor_register_idle_driver(void)
 
 void acpi_processor_unregister_idle_driver(void)
 {
+	struct acpi_processor *pr;
+	int cpu;
+
 	cpuidle_unregister_driver(&acpi_idle_driver);
+	for_each_possible_cpu(cpu) {
+		pr = per_cpu(processors, cpu);
+		if (!pr)
+			continue;
+		pr->flags.power_setup_done = 0;
+	}
 }
 
 void acpi_processor_power_init(struct acpi_processor *pr)
@@ -1424,6 +1434,7 @@ void acpi_processor_power_init(struct acpi_processor *pr)
 	 */
 	if (cpuidle_register_device(dev)) {
 		per_cpu(acpi_cpuidle_device, pr->id) = NULL;
+		pr->flags.power_setup_done = 0;
 		kfree(dev);
 	}
 }