ACPI: Add _UID support for ACPI devices.

The _UID object is optional, but is required when the device has no
other way to report a persistent unique device ID.
This patch is required for ACPI 5.0 ACPI enumerated IP cores.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rui Zhang <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 19d3d4a1274a..daa88d527e84 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -381,6 +381,7 @@ static void acpi_device_release(struct device *dev)
         struct acpi_device *acpi_dev = to_acpi_device(dev);
 
         acpi_free_ids(acpi_dev);
+        kfree(acpi_dev->pnp.unique_id);
         kfree(acpi_dev);
 }
 
@@ -1211,6 +1212,9 @@ static void acpi_device_set_id(struct acpi_device *device)
                         device->pnp.bus_address = info->address;
                         device->flags.bus_address = 1;
                 }
+                if (info->valid & ACPI_VALID_UID)
+                        device->pnp.unique_id = kstrdup(info->unique_id.string,
+                                                        GFP_KERNEL);
 
                 kfree(info);