[PATCH] Reuse PHB/domain number on PCI adresses when available

[Guilherme G. Piccoli]

This patch changes the way PCI domain numbers are generated on powerpc.
No functional changes were introduced. The reason for this modification
is better explained on patch's commit message, but in short we currently
increment a global variable at each new PHB discovered, and use this
value as domain number. The problem is that in some cases, like PCI
device hotplug remove and re-add, the address is changed - as modern
kernels are using predictable network naming for example, we can end up
having some issues tracking network interfaces after hotplug operations.

I CC'ed both cxl folks, Bjorn and PCI list, so we can be sure this
modification, if accepted, won't impact any other related area.

Thanks in advance,


Guilherme

Guilherme G. Piccoli (1):
  powerpc/pci: Reuse PHB number on pci_controller add if available

 arch/powerpc/kernel/pci-common.c | 47 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 3 deletions(-)

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2.1.0