1 files changed, 66 insertions, 1 deletions

diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index 539babf00bb2..b36365f49478 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -432,6 +432,11 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
                        node->full_name);
                 return;
         }
+
+        if (ofpci_verbose)
+                printk("    Bridge bus range [%u --> %u]\n",
+                       busrange[0], busrange[1]);
+
         ranges = of_get_property(node, "ranges", &len);
         simba = 0;
         if (ranges == NULL) {
@@ -451,6 +456,10 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
         pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
         bus->bridge_ctl = 0;
 
+        if (ofpci_verbose)
+                printk("    Bridge ranges[%p] simba[%d]\n",
+                       ranges, simba);
+
         /* parse ranges property, or cook one up by hand for Simba */
         /* PCI #address-cells == 3 and #size-cells == 2 always */
         res = &dev->resource[PCI_BRIDGE_RESOURCES];
@@ -468,10 +477,29 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
         }
         i = 1;
         for (; len >= 32; len -= 32, ranges += 8) {
+                u64 start;
+
+                if (ofpci_verbose)
+                        printk("    RAW Range[%08x:%08x:%08x:%08x:%08x:%08x:"
+                               "%08x:%08x]\n",
+                               ranges[0], ranges[1], ranges[2], ranges[3],
+                               ranges[4], ranges[5], ranges[6], ranges[7]);
+
                 flags = pci_parse_of_flags(ranges[0]);
                 size = GET_64BIT(ranges, 6);
                 if (flags == 0 || size == 0)
                         continue;
+
+                /* On PCI-Express systems, PCI bridges that have no devices downstream
+                 * have a bogus size value where the first 32-bit cell is 0xffffffff.
+                 * This results in a bogus range where start + size overflows.
+                 *
+                 * Just skip these otherwise the kernel will complain when the resource
+                 * tries to be claimed.
+                 */
+                if (size >> 32 == 0xffffffff)
+                        continue;
+
                 if (flags & IORESOURCE_IO) {
                         res = bus->resource[0];
                         if (res->flags) {
@@ -490,8 +518,13 @@ static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
                 }
 
                 res->flags = flags;
-                region.start = GET_64BIT(ranges, 1);
+                region.start = start = GET_64BIT(ranges, 1);
                 region.end = region.start + size - 1;
+
+                if (ofpci_verbose)
+                        printk("      Using flags[%08x] start[%016llx] size[%016llx]\n",
+                               flags, start, size);
+
                 pcibios_bus_to_resource(dev->bus, res, &region);
         }
 after_ranges:
@@ -584,6 +617,36 @@ static void pci_bus_register_of_sysfs(struct pci_bus *bus)
                 pci_bus_register_of_sysfs(child_bus);
 }
 
+static void pci_claim_bus_resources(struct pci_bus *bus)
+{
+        struct pci_bus *child_bus;
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                int i;
+
+                for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+                        struct resource *r = &dev->resource[i];
+
+                        if (r->parent || !r->start || !r->flags)
+                                continue;
+
+                        if (ofpci_verbose)
+                                printk("PCI: Claiming %s: "
+                                       "Resource %d: %016llx..%016llx [%x]\n",
+                                       pci_name(dev), i,
+                                       (unsigned long long)r->start,
+                                       (unsigned long long)r->end,
+                                       (unsigned int)r->flags);
+
+                        pci_claim_resource(dev, i);
+                }
+        }
+
+        list_for_each_entry(child_bus, &bus->children, node)
+                pci_claim_bus_resources(child_bus);
+}
+
 struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
                                  struct device *parent)
 {
@@ -614,6 +677,8 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
         pci_bus_add_devices(bus);
         pci_bus_register_of_sysfs(bus);
 
+        pci_claim_bus_resources(bus);
+
         return bus;
 }