PCI: Claim hw/fw allocated resources in hot add path.
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 from
arch/x86/pci/i386.c::pcibios_allocate_resources()
that is init path.
Try to claim those resources, so on the remove/rescan will still use old
resources.
It is some kind honoring HW/FW setting in the registers during hot add.
esp root-bus hot add is through acpi, BIOS have chance to set some register
for us.
-v2: add rom resource claiming.
-v3: separate __init removing to another patch, also
put pci_probe checking with caller from rom resource allocating
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
3 files changed
