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OpenCloudOS-Kernel
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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>
This commit is contained in:
Radim Krčmář 2016-03-02 22:56:46 +01:00 committed by Paolo Bonzini
parent 71474e2f0f
commit 10d2482126
1 changed files with 12 additions and 15 deletions
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27
arch/x86/kvm/i8254.c
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@ -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;
}