amd64-agp: fix crash at second module load

The module forgot to sometimes unregister some resources.

This fixes Bug #22882.

[Patch updated to 2.6.38-rc3 by Randy Dunlap.]
Tested-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Florian Mickler <florian@mickler.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index 9252e85..780498d 100644 (file)
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -773,18 +773,23 @@ int __init agp_amd64_init(void)
 #else
                        printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n");
 #endif
+                       pci_unregister_driver(&agp_amd64_pci_driver);
                        return -ENODEV;
                }
 
                /* First check that we have at least one AMD64 NB */
-               if (!pci_dev_present(amd_nb_misc_ids))
+               if (!pci_dev_present(amd_nb_misc_ids)) {
+                       pci_unregister_driver(&agp_amd64_pci_driver);
                        return -ENODEV;
+               }
 
                /* Look for any AGP bridge */
                agp_amd64_pci_driver.id_table = agp_amd64_pci_promisc_table;
                err = driver_attach(&agp_amd64_pci_driver.driver);
-               if (err == 0 && agp_bridges_found == 0)
+               if (err == 0 && agp_bridges_found == 0) {
+                       pci_unregister_driver(&agp_amd64_pci_driver);
                        err = -ENODEV;
+               }
        }
        return err;
 }