Re: [PATCH 1/1] PCI: acpiphp:: use pci_assign_unassigned_bridge_resources() only if bus->self not NULL

[Michael S. Tsirkin]

On Mon, Jul 31, 2023 at 04:42:51PM -0500, Bjorn Helgaas wrote:
> I would expect hot-add to be handled via a Bus Check to the *parent*
> of a new device, so the device tree would only need to describe
> hardware that's present at boot.  That would mean pci_root.c would
> have some .notify() handler, but I don't see anything there.

That has a big performance cost though - OSPM has no way to figure out
on which slot the new device is, so has to rescan the whole bus.