I've been working on a userspace daemon to go with my CompactPCI driver,
and yesterday I discovered an oversight in pci_hp_change_slot_info - it
doesn't call dnotify_parent, so dnotify based clients basically don't
work against pcihpfs.  The following patch (against 2.5 BK) reworks
things to just update the mtime (since we're modifying the file after
all), and then call dnotify_parent.