pci: allow cleanup/unregistration of PCI root buses
This adds cleanup counterparts to pci_register_root_bus(), pci_root_bus_new(), and pci_bus_irqs(). These cleanup routines are needed in the case of hotpluggable PCIHostBridge implementations. Currently we can rely on the object_unparent()'ing of the PCIHostState recursively unparenting and cleaning up it's child buses, but we need explicit calls to also: 1) remove the PCIHostState from pci_host_bridges global list. otherwise, we risk accessing freed memory when we access the list later 2) clean up memory allocated in pci_bus_irqs() Both are handled outside the context of any particular bus or host bridge's init/realize functions, making it difficult to avoid the need for explicit cleanup functions without remodeling how PCIHostBridges are created. So keep it simple and just add them for now. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NGreg Kurz <groug@kaod.org> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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