Re: [PATCH v3 1/3] vfio/pci: Fix resource leak in vfio_realize

[Joao Martins <joao.m.martins@oracle.com>]

>>>  out_deregister:
>>>      pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
>>>      if (vdev->irqchip_change_notifier.notify) {
>>>          kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier);
>>>      }
>>> +    vfio_disable_interrupts(vdev);
>>> +    if (vdev->intx.mmap_timer) {
>>> +        timer_free(vdev->intx.mmap_timer);
>>> +    }
>>
>> But this one suggests another one as it looks a pre-existing issue?
> Yes, it's another resource leak I just found.
> Not sure if it's better to also merge above change to this patch which is targeting resource leak issues,
> or to PATCH2 which is targeting out_deregister path, or to create a new one.
> Any suggestion?

In general they are all bugs in the same deregistration path, but each resource
is not being teardown correctly. I tend to prefer 'logical change' per commit,
so there's would be a fix the irqchip_change notifier and another one for
mmap_timer teardown. Both with the Fixes tags that introduced each bug. Unless
everything was introduced by the same change in which case you would do
everything in one patch.