intel_idle: Clean up all registered devices on exit.

This driver registers cpuidle devices when a CPU comes online, but it
leaves the registrations in place when a CPU goes offline.  The module
exit code only unregisters the currently online CPUs, leaving the
devices for offline CPUs dangling.

This patch changes the driver to clean up all registrations on exit,
even those from CPUs that are offline.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 8420ba10a434..862346bd053a 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -1245,12 +1245,19 @@ static int __init intel_idle_init(void)
 
 static void __exit intel_idle_exit(void)
 {
+        struct cpuidle_device *dev;
+        int i;
+
         cpu_notifier_register_begin();
 
         if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE)
                 on_each_cpu(__setup_broadcast_timer, (void *)false, 1);
         __unregister_cpu_notifier(&cpu_hotplug_notifier);
-        intel_idle_cpuidle_devices_uninit();
+
+        for_each_possible_cpu(i) {
+                dev = per_cpu_ptr(intel_idle_cpuidle_devices, i);
+                cpuidle_unregister_device(dev);
+        }
 
         cpu_notifier_register_done();