1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 59639c9c6666..a54ff6bce8fa 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1262,8 +1262,37 @@ acpi_video_bus_write_DOS(struct file *file,
 
 static int acpi_video_bus_add_fs(struct acpi_device *device)
 {
+        long device_id;
+        int status;
         struct proc_dir_entry *entry = NULL;
         struct acpi_video_bus *video;
+        struct device *dev;
+
+        status =
+            acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
+
+        if (!ACPI_SUCCESS(status))
+                return -ENODEV;
+
+        /* We need to attempt to determine whether the _ADR refers to a
+           PCI device or not. There's no terribly good way to do this,
+           so the best we can hope for is to assume that there'll never
+           be a video device in the host bridge */
+        if (device_id >= 0x10000) {
+                /* It looks like a PCI device. Does it exist? */
+                dev = acpi_get_physical_device(device->handle);
+        } else {
+                /* It doesn't look like a PCI device. Does its parent
+                   exist? */
+                acpi_handle phandle;
+                if (acpi_get_parent(device->handle, &phandle))
+                        return -ENODEV;
+                dev = acpi_get_physical_device(phandle);
+        }
+        if (!dev)
+                return -ENODEV;
+        put_device(dev);
+
 
 
         video = acpi_driver_data(device);