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@xxxxxxxxxx> --- arch/x86/pci/i386.c | 13 +++++++++++++ drivers/pci/bus.c | 2 ++ include/linux/pci.h | 1 + 3 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index 1806e91..e0b7f30 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -352,6 +352,19 @@ static int __init pcibios_assign_resources(void) return 0; } +void pcibios_resource_survey_bus(struct pci_bus *bus) +{ + dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n"); + + pcibios_allocate_bus_resources(bus); + + pcibios_allocate_resources(bus, 0); + pcibios_allocate_resources(bus, 1); + + if (!(pci_probe & PCI_ASSIGN_ROMS)) + pcibios_allocate_rom_resources(bus); +} + void __init pcibios_resource_survey(void) { struct pci_bus *bus; diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 4b0970b..2882d01 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -154,6 +154,8 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, return ret; } +void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } + /** * pci_bus_add_device - add a single device * @dev: device to add diff --git a/include/linux/pci.h b/include/linux/pci.h index be1de01..ec25403 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -676,6 +676,7 @@ extern struct list_head pci_root_buses; /* list of all known PCI buses */ /* Some device drivers need know if pci is initiated */ extern int no_pci_devices(void); +void pcibios_resource_survey_bus(struct pci_bus *bus); void pcibios_fixup_bus(struct pci_bus *); int __must_check pcibios_enable_device(struct pci_dev *, int mask); /* Architecture specific versions may override this (weak) */ -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html