diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index e98071a648107ccd71ad8ac81ce5753d3e67b91c..0133af49cf06851ebb60d756404f48938b299c6f 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -95,10 +95,10 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
 	if (ignore_ppc)
 		return 0;
 
-	mutex_lock(&performance_mutex);
-
 	if (event != CPUFREQ_INCOMPATIBLE)
-		goto out;
+		return 0;
+
+	mutex_lock(&performance_mutex);
 
 	pr = per_cpu(processors, policy->cpu);
 	if (!pr || !pr->performance)