[patch 03/12] Make pcibios_fixup_bus() hot-plug safe

Rajesh Shah
2005-03-18T22:02:27Z

PCI scan code calls the arch specific pcibios_fixup_bus() each
time it scans a new bridge. For root bridge hot-plug, the bridge
and it's attached devices may not have been configured properly
yet, so it's not safe to claim those resources at this time.

This code goes away when we clean up the way pci resources are
claimed (in pci_enable_device()), so this is only a stopgap fix.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
---

linux-2.6.11-mm4-iohp-rshah1/arch/ia64/pci/pci.c | 22 +++++++++++++++++++++-
1 files changed, 21 insertions(+), 1 deletion(-)

diff -puN arch/ia64/pci/pci.c~ia64-pcibios_fixup_bus-hotplug-safe arch/ia64/pci/pci.c
--- linux-2.6.11-mm4-iohp/arch/ia64/pci/pci.c~ia64-pcibios_fixup_bus-hotplug-safe 2005-03-16 13:07:06.343101214 -0800
+++ linux-2.6.11-mm4-iohp-rshah1/arch/ia64/pci/pci.c 2005-03-16 13:07:06.450523088 -0800
@@ -391,6 +391,25 @@ void pcibios_bus_to_resource(struct pci_
res->end = region->end + offset;
}

+static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
+{
+ unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+ struct resource *devr = &dev->resource[idx];
+
+ if (!dev->bus)
+ return 0;
+ for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
+ struct resource *busr = dev->bus->resource[i];
+
+ if (!busr || ((busr->flags ^ devr->flags) & type_mask))
+ continue;
+ if ((devr->start) && (devr->start >= busr->start) &&
+ (devr->end <= busr->end))
+ return 1;
+ }
+ return 0;
+}
+
static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
{
struct pci_bus_region region;
@@ -404,7 +423,8 @@ static void __devinit pcibios_fixup_devi
region.start = dev->resource[i].start;
region.end = dev->resource[i].end;
pcibios_bus_to_resource(dev, &dev->resource[i], &region);
- pci_claim_resource(dev, i);
+ if ((is_valid_resource(dev, i)))
+ pci_claim_resource(dev, i);
}
}

_