KVM: i8254: refactor kvm_create_pit

Locks are gone, so we don't need to duplicate error paths.
Use goto everywhere.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 7a2f14b..c24735a 100644 (file)
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -676,10 +676,8 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
                return NULL;
 
        pit->irq_source_id = kvm_request_irq_source_id(kvm);
-       if (pit->irq_source_id < 0) {
-               kfree(pit);
-               return NULL;
-       }
+       if (pit->irq_source_id < 0)
+               goto fail_request;
 
        mutex_init(&pit->pit_state.lock);
 
@@ -690,11 +688,9 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
        init_kthread_worker(&pit->worker);
        pit->worker_task = kthread_run(kthread_worker_fn, &pit->worker,
                                       "kvm-pit/%d", pid_nr);
-       if (IS_ERR(pit->worker_task)) {
-               kvm_free_irq_source_id(kvm, pit->irq_source_id);
-               kfree(pit);
-               return NULL;
-       }
+       if (IS_ERR(pit->worker_task))
+               goto fail_kthread;
+
        init_kthread_work(&pit->expired, pit_do_work);
 
        pit->kvm = kvm;
@@ -715,7 +711,7 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
        ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, KVM_PIT_BASE_ADDRESS,
                                      KVM_PIT_MEM_LENGTH, &pit->dev);
        if (ret < 0)
-               goto fail;
+               goto fail_register_pit;
 
        if (flags & KVM_PIT_SPEAKER_DUMMY) {
                kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
@@ -723,18 +719,19 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
                                              KVM_SPEAKER_BASE_ADDRESS, 4,
                                              &pit->speaker_dev);
                if (ret < 0)
-                       goto fail_unregister;
+                       goto fail_register_speaker;
        }
 
        return pit;
 
-fail_unregister:
+fail_register_speaker:
        kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->dev);
-
-fail:
+fail_register_pit:
        kvm_pit_set_reinject(pit, false);
-       kvm_free_irq_source_id(kvm, pit->irq_source_id);
        kthread_stop(pit->worker_task);
+fail_kthread:
+       kvm_free_irq_source_id(kvm, pit->irq_source_id);
+fail_request:
        kfree(pit);
        return NULL;
 }