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ACPI: Add _UID support for ACPI devices.

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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>
This commit is contained in:
Lv Zheng 2012-10-30 14:41:07 +01:00 committed by Rafael J. Wysocki
parent 9743fdea9f
commit ccf7804026
1 changed files with 4 additions and 0 deletions
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4
drivers/acpi/scan.c
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@ -381,6 +381,7 @@ static void acpi_device_release(struct device *dev)
struct acpi_device *acpi_dev = to_acpi_device(dev); struct acpi_device *acpi_dev = to_acpi_device(dev);
acpi_free_ids(acpi_dev); acpi_free_ids(acpi_dev);
kfree(acpi_dev->pnp.unique_id);
kfree(acpi_dev); kfree(acpi_dev);
} }
@ -1211,6 +1212,9 @@ static void acpi_device_set_id(struct acpi_device *device)
device->pnp.bus_address = info->address; device->pnp.bus_address = info->address;
device->flags.bus_address = 1; device->flags.bus_address = 1;
} }
if (info->valid & ACPI_VALID_UID)
device->pnp.unique_id = kstrdup(info->unique_id.string,
GFP_KERNEL);
kfree(info); kfree(info);