Hi; does anybody know how device reference counting is supposed to work when the device creates a "container" MemoryRegion which it then puts some of its own subregions in to?
As far as I can see when you do memory_region_add_subregion it increases the refcount on the owner of the subregion. So if a device creates a container MR in its own init or realize method and adds sub-MRs that it owns to that container, this increases the refcount on the device permanently, and so the device won't ever be deinited. As a specific example, the usb-chipidea device does this in its init method, so if you run the arm device-introspect-test under leak-sanitizer it complains about a memory leak that happens when the device is put through the "init-introspect-deref" cycle. -- PMM
