ACPI: scan: Do not add device IDs from _CID if _HID is not valid

Section 6.1.2 of ACPI 6.4 explicitly requires _HID to be present for
_CID to be defined, so don't add device IDs from _CID to the device
IDs list of a device if _HID is not valid.

Link: https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration.html#cid-compatible-id
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 2c80765..5991ddd 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1340,11 +1340,11 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
                if (info->valid & ACPI_VALID_HID) {
                        acpi_add_id(pnp, info->hardware_id.string);
                        pnp->type.platform_id = 1;
-               }
-               if (info->valid & ACPI_VALID_CID) {
-                       cid_list = &info->compatible_id_list;
-                       for (i = 0; i < cid_list->count; i++)
-                               acpi_add_id(pnp, cid_list->ids[i].string);
+                       if (info->valid & ACPI_VALID_CID) {
+                               cid_list = &info->compatible_id_list;
+                               for (i = 0; i < cid_list->count; i++)
+                                       acpi_add_id(pnp, cid_list->ids[i].string);
+                       }
                }
                if (info->valid & ACPI_VALID_ADR) {
                        pnp->bus_address = info->address;