[SPARC64]: Fix 2 bugs in PCI Sabre bus scanning.

If we are on hummingbird, bus runs at 66MHZ.

pbm->pci_bus should be setup with the result of pci_scan_one_pbm()
or else we deref NULL pointers in the error interrupt handlers.

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

1 files changed, 11 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index 323d6c278518..22e1be5c7489 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -636,13 +636,18 @@ static void apb_init(struct pci_bus *sabre_bus)
 static void sabre_scan_bus(struct pci_pbm_info *pbm)
 {
         static int once;
-        struct pci_bus *pbus;
 
         /* The APB bridge speaks to the Sabre host PCI bridge
          * at 66Mhz, but the front side of APB runs at 33Mhz
          * for both segments.
+         *
+         * Hummingbird systems do not use APB, so they run
+         * at 66MHZ.
          */
-        pbm->is_66mhz_capable = 0;
+        if (hummingbird_p)
+                pbm->is_66mhz_capable = 1;
+        else
+                pbm->is_66mhz_capable = 0;
 
         /* This driver has not been verified to handle
          * multiple SABREs yet, so trap this.
@@ -656,13 +661,13 @@ static void sabre_scan_bus(struct pci_pbm_info *pbm)
         }
         once++;
 
-        pbus = pci_scan_one_pbm(pbm);
-        if (!pbus)
+        pbm->pci_bus = pci_scan_one_pbm(pbm);
+        if (!pbm->pci_bus)
                 return;
 
-        sabre_root_bus = pbus;
+        sabre_root_bus = pbm->pci_bus;
 
-        apb_init(pbus);
+        apb_init(pbm->pci_bus);
 
         sabre_register_error_handlers(pbm);
 }