diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 528daadeba4953251e3bc5916a839b2637858b6a..69d1bbff3fd3f5028245249f1637574bf8bdfaab 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -548,9 +548,7 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm)
 	if (!pit)
 		return NULL;
 
-	mutex_lock(&kvm->lock);
 	pit->irq_source_id = kvm_request_irq_source_id(kvm);
-	mutex_unlock(&kvm->lock);
 	if (pit->irq_source_id < 0) {
 		kfree(pit);
 		return NULL;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a1f14611f4b926cac053409764da40acff06d307..6fbc346033752132dccd2a5227c150078bc60bb4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1837,10 +1837,16 @@ long kvm_arch_vm_ioctl(struct file *filp,
 			goto out;
 		break;
 	case KVM_CREATE_PIT:
+		mutex_lock(&kvm->lock);
+		r = -EEXIST;
+		if (kvm->arch.vpit)
+			goto create_pit_unlock;
 		r = -ENOMEM;
 		kvm->arch.vpit = kvm_create_pit(kvm);
 		if (kvm->arch.vpit)
 			r = 0;
+	create_pit_unlock:
+		mutex_unlock(&kvm->lock);
 		break;
 	case KVM_IRQ_LINE: {
 		struct kvm_irq_level irq_event;