On Tue, Jun 05, 2012 at 12:38:52PM -0700, Yinghai Lu wrote: >> >> Yinghai, >> >> is there a reason why this can't be fixed in >> pci_create_root_bus() by having >> bus->self = bridge; /* 'bridge' is the pci_device of the corresponding host bridge */ >> get_device(&bridge->dev); > >self is pointer to pci_dev bridge. > >and for root bus, it is NULL. that mean no pci bridge device related. > >bridge is device, and have that assigned from host bridge dev, or pci >bridge dev. > >also for virtfn of iov, new bus from there will not have self assigned too. >for it even bridge is not assigned. > >so bridge is just generic way to save bridge (pci, host) device ... I did a summarize, we have three types of pci_bus. Can we identify the type by following method? +--------------------+--------------------------------------------------+ | bus type | identification | +--------------------+--------------------------------------------------+ | root_bus |parent is NULL, bridge point to host_bridge dev | +--------------------+--------------------------------------------------+ | general_bus |parent to parent bus, bridge point to the bridge | +--------------------+--------------------------------------------------+ | iov_bus |parent to parent bus, bridge point to NULL | +--------------------+--------------------------------------------------+ -- Richard Yang Help you, Help me -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
