1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 269c0aae4bed..53b96e7a64ab 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1155,6 +1155,16 @@ static void acpi_device_set_id(struct acpi_device *device)
                 break;
         }
 
+        /*
+         * We build acpi_devices for some objects that don't have _HID or _CID,
+         * e.g., PCI bridges and slots.  Drivers can't bind to these objects,
+         * but we do use them indirectly by traversing the acpi_device tree.
+         * This generic ID isn't useful for driver binding, but it provides
+         * the useful property that "every acpi_device has an ID."
+         */
+        if (!hid && !cid_list && !cid_add)
+                hid = "device";
+
         if (hid) {
                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
                 if (device->pnp.hardware_id) {