diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 9f11dc2..a735108 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -44,6 +44,7 @@
 #include <linux/seq_file.h>
 #include <linux/dmi.h>
 #include <linux/moduleparam.h>
+#include <linux/cpuidle.h>
 
 #include <asm/io.h>
 #include <asm/system.h>
@@ -1049,11 +1050,13 @@
 		return -ENOMEM;
 	acpi_processor_dir->owner = THIS_MODULE;
 
+	result = cpuidle_register_driver(&acpi_idle_driver);
+	if (result < 0)
+		goto out_proc;
+
 	result = acpi_bus_register_driver(&acpi_processor_driver);
-	if (result < 0) {
-		remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
-		return result;
-	}
+	if (result < 0)
+		goto out_cpuidle;
 
 	acpi_processor_install_hotplug_notify();
 
@@ -1062,11 +1065,18 @@
 	acpi_processor_ppc_init();
 
 	return 0;
+
+out_cpuidle:
+	cpuidle_unregister_driver(&acpi_idle_driver);
+
+out_proc:
+	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+
+	return result;
 }
 
 static void __exit acpi_processor_exit(void)
 {
-
 	acpi_processor_ppc_exit();
 
 	acpi_thermal_cpufreq_exit();
@@ -1075,6 +1085,8 @@
 
 	acpi_bus_unregister_driver(&acpi_processor_driver);
 
+	cpuidle_unregister_driver(&acpi_idle_driver);
+
 	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 
 	return;