diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index e28f6a5d14f1..766ffe3ba313 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -291,8 +291,10 @@ void kvm_set_posted_intr_wakeup_handler(void (*handler)(void))
 {
 	if (handler)
 		kvm_posted_intr_wakeup_handler = handler;
-	else
+	else {
 		kvm_posted_intr_wakeup_handler = dummy_handler;
+		synchronize_rcu();
+	}
 }
 EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler);