amd64-agp: Probe unknown AGP devices the right way

commit 6fd024893911dcb51b4a0aa71971db5ba38f7071 upstream.

The current initialisation code probes 'unsupported' AGP devices
simply by calling its own probe function.  It does not lock these
devices or even check whether another driver is already bound to
them.

We must use the device core to manage this.  So if the specific
device id table didn't match anything and agp_try_unsupported=1,
switch the device id table and call driver_attach() again.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index 7495c522d8e477ac3aa0431c95fead255e7879ac..e144ad8178d4cf641e8f48a9dfc83b47e663816d 100644 (file)
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -491,6 +491,10 @@ static int __devinit agp_amd64_probe(struct pci_dev *pdev,
        u8 cap_ptr;
        int err;
 
+       /* The Highlander principle */
+       if (agp_bridges_found)
+               return -ENODEV;
+
        cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
        if (!cap_ptr)
                return -ENODEV;
@@ -554,6 +558,8 @@ static void __devexit agp_amd64_remove(struct pci_dev *pdev)
                           amd64_aperture_sizes[bridge->aperture_size_idx].size);
        agp_remove_bridge(bridge);
        agp_put_bridge(bridge);
+
+       agp_bridges_found--;
 }
 
 #ifdef CONFIG_PM
@@ -701,6 +707,11 @@ static struct pci_device_id agp_amd64_pci_table[] = {
 
 MODULE_DEVICE_TABLE(pci, agp_amd64_pci_table);
 
+static DEFINE_PCI_DEVICE_TABLE(agp_amd64_pci_promisc_table) = {
+       { PCI_DEVICE_CLASS(0, 0) },
+       { }
+};
+
 static struct pci_driver agp_amd64_pci_driver = {
        .name           = "agpgart-amd64",
        .id_table       = agp_amd64_pci_table,
@@ -725,7 +736,6 @@ int __init agp_amd64_init(void)
                return err;
 
        if (agp_bridges_found == 0) {
-               struct pci_dev *dev;
                if (!agp_try_unsupported && !agp_try_unsupported_boot) {
                        printk(KERN_INFO PFX "No supported AGP bridge found.\n");
 #ifdef MODULE
@@ -741,17 +751,10 @@ int __init agp_amd64_init(void)
                        return -ENODEV;
 
                /* Look for any AGP bridge */
-               dev = NULL;
-               err = -ENODEV;
-               for_each_pci_dev(dev) {
-                       if (!pci_find_capability(dev, PCI_CAP_ID_AGP))
-                               continue;
-                       /* Only one bridge supported right now */
-                       if (agp_amd64_probe(dev, NULL) == 0) {
-                               err = 0;
-                               break;
-                       }
-               }
+               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)
+                       err = -ENODEV;
        }
        return err;
 }