> -----Original Message----- > From: yhlu.kernel@xxxxxxxxx [mailto:yhlu.kernel@xxxxxxxxx] On Behalf Of > Yinghai Lu > Sent: Sunday, September 20, 2015 02:20 > To: Bjorn Helgaas > Cc: Tang, Jason (ES); linux-pci@xxxxxxxxxxxxxxx > Subject: EXT :Re: [PATCH v1 3/7] PCI: Let kcmdline reserve bus numbers for > hotplug bridges > > from bus [old_max, old_max+pci_hotplug_buses) could be used by other > bridges, > and other bridges could even get probed yet. I have tested the case where a subsequent bridge has not been probed yet and the BIOS is assigning it the same bus number. The behavior I observed is that conflicting bus numbers will be fixed during the second pass of PCI probing. See pci_scan_bridge() in drivers/pci/probe.c, lines 875-880 on tag v4.3-rc2. Also observe how patch 7 in my series updates the preceding conditional (line 874) to also check if the device is a hotpluggable bridge. > Also it could even cross the boundary to other peer root bus range. I am not sure what you mean by this. Can you elaborate? ��.n��������+%������w��{.n�����{���"�)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
