On Thu, Sep 17, 2015 at 2:11 PM, Tang, Jason (ES) <Jason.Tang2@xxxxxxx> wrote: > This introduces a new kernel command line parameter, "hpbuses", that > allows the user to set how many bus numbers to reserve for hotplug > bridges. The default value is 0, which means do not reserve any bus > numbers for bridges that are hot-added after enumeration completes. > > During device probing, increment a hotplug bridge's subordinate bus > number by the amount set by "hpbuses". This way, bridges that are > hot-added after enumeration can have buses reserved for them. > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 58ae892..553b345 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -930,6 +930,8 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) > /* > * Set the subordinate bus number to its real value. > */ > + if (child->self->is_hotplug_bridge) > + max += pci_hotplug_buses; > child->subordinate = max; > pci_bus_update_busn_res_end(child, child->subordinate); > pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, No, you can not increase the max blindly. Yinghai -- 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
