1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index 52f4361eb6e4..d765afda9c2a 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -271,15 +271,15 @@ static __devinit int fix_northbridge(struct pci_dev *nb, struct pci_dev *agp,
         nb_order = (nb_order >> 1) & 7;
         pci_read_config_dword(nb, AMD64_GARTAPERTUREBASE, &nb_base);
         nb_aper = nb_base << 25;
-        if (agp_aperture_valid(nb_aper, (32*1024*1024)<<nb_order)) {
-                return 0;
-        }
 
         /* Northbridge seems to contain crap. Try the AGP bridge. */
 
         pci_read_config_word(agp, cap+0x14, &apsize);
-        if (apsize == 0xffff)
+        if (apsize == 0xffff) {
+                if (agp_aperture_valid(nb_aper, (32*1024*1024)<<nb_order))
+                        return 0;
                 return -1;
+        }
 
         apsize &= 0xfff;
         /* Some BIOS use weird encodings not in the AGPv3 table. */
@@ -301,6 +301,11 @@ static __devinit int fix_northbridge(struct pci_dev *nb, struct pci_dev *agp,
                 order = nb_order;
         }
 
+        if (nb_order >= order) {
+                if (agp_aperture_valid(nb_aper, (32*1024*1024)<<nb_order))
+                        return 0;
+        }
+
         dev_info(&agp->dev, "aperture from AGP @ %Lx size %u MB\n",
                  aper, 32 << order);
         if (order < 0 || !agp_aperture_valid(aper, (32*1024*1024)<<order))