tree cbddd9ca52a24d2a414c48e375d89f8c36596087
parent af8c34ce6ae32addda3788d54a7e340cad22516b
author Keith Busch <keith.busch@intel.com> 1469158828 -0600
committer Bjorn Helgaas <bhelgaas@google.com> 1469469167 -0500

PCI: Allow additional bus numbers for hotplug bridges

A user may hot add a switch requiring more than one bus to enumerate.  This
previously required a system reboot if BIOS did not sufficiently pad the
bus resource, which they frequently don't do.

Add a kernel parameter so a user can specify the minimum number of bus
numbers to reserve for a hotplug bridge's subordinate buses so rebooting
won't be necessary.

The default is 1, which is equivalent to previous behavior.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>