agp/intel: put back check that we have a driver for the bridge.

On my 945 laptop + radeon GPU, I was getting an oops on boot without this
check which seems to have gotten dropped in the rework.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 07a9aad..034644e 100644 (file)
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -885,6 +885,14 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
                return -ENODEV;
        }
 
+       if (!bridge->driver) {
+               if (cap_ptr)
+                       dev_warn(&pdev->dev, "can't find bridge device (chip_id: %04x)\n",
+                                intel_agp_chipsets[i].gmch_chip_id);
+               agp_put_bridge(bridge);
+               return -ENODEV;
+       }
+
        bridge->dev = pdev;
        bridge->dev_private_data = NULL;