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-rw-r--r--drivers/acpi/scan.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 269c0aae4be..53b96e7a64a 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) {