[SPARC64]: Fix booting on V100 systems.

On the root PCI bus, the OBP device tree lists device 3 twice.
Once as 'pm' and once as 'lomp'.

Everything goes downhill from there.

Ignore the second instance to workaround this.

Thanks to Kövedi_Krisztián for the bug report and
testing the fix.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 1 deletions

diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
index 139b4cff8019..e8dac81d8a0d 100644
--- a/arch/sparc64/kernel/pci.c
+++ b/arch/sparc64/kernel/pci.c
@@ -744,7 +744,7 @@ static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
 {
         struct device_node *child;
         const u32 *reg;
-        int reglen, devfn;
+        int reglen, devfn, prev_devfn;
         struct pci_dev *dev;
 
         if (ofpci_verbose)
@@ -752,14 +752,25 @@ static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
                        node->full_name, bus->number);
 
         child = NULL;
+        prev_devfn = -1;
         while ((child = of_get_next_child(node, child)) != NULL) {
                 if (ofpci_verbose)
                         printk("  * %s\n", child->full_name);
                 reg = of_get_property(child, "reg", &reglen);
                 if (reg == NULL || reglen < 20)
                         continue;
+
                 devfn = (reg[0] >> 8) & 0xff;
 
+                /* This is a workaround for some device trees
+                 * which list PCI devices twice.  On the V100
+                 * for example, device number 3 is listed twice.
+                 * Once as "pm" and once again as "lomp".
+                 */
+                if (devfn == prev_devfn)
+                        continue;
+                prev_devfn = devfn;
+
                 /* create a new pci_dev for this device */
                 dev = of_create_pci_dev(pbm, child, bus, devfn, 0);
                 if (!dev)