PCI: Allow additional bus numbers for hotplug bridges

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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>

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This commit is contained in:

Keith Busch 2016-07-21 21:40:28 -06:00 • committed by Bjorn Helgaas

parent af8c34ce6a

commit e16b466059

4 changed files with 21 additions and 0 deletions

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3

Documentation/kernel-parameters.txt

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8

drivers/pci/pci.c

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9

drivers/pci/probe.c

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1

include/linux/pci.h

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