x86/PCI: Implement pcibios_resource_survey_bus()
authorYinghai Lu <yinghai@kernel.org>
Sun, 4 Nov 2012 04:39:30 +0000 (21:39 -0700)
committerBjorn Helgaas <bhelgaas@google.com>
Mon, 7 Jan 2013 22:58:48 +0000 (15:58 -0700)
commitb3e65e1f9185a2eb034defe4270ba178ba70b9a9
tree3ddb43c3333138c9dd3692276ef8d541b6000213
parent3c449ed0075994b3f3371f8254560428ba787efc
x86/PCI: Implement pcibios_resource_survey_bus()

During testing remove/rescan root bus 00, found
[  338.142574] bus: 'pci': really_probe: probing driver ata_piix with device 0000:00:01.1
[  338.146788] ata_piix 0000:00:01.1: device not available (can't reserve [io  0x01f0-0x01f7])
[  338.150565] ata_piix: probe of 0000:00:01.1 failed with error -22

because that fixed resource is not claimed.
For bootint path it is claimed in  from
        arch/x86/pci/i386.c::pcibios_allocate_resources()

Claim those resources, so on the remove/rescan will still use old
resources.

It is some kind honoring FW setting in the registers during hot add.
esp root-bus hot add is through acpi, BIOS has chance to set some registers
before handing over.

[bhelgaas: move weak definition to patch that uses it]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
arch/x86/pci/i386.c