diff options
| -rw-r--r-- | drivers/acpi/scan.c | 50 |
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index f2e283426be9..f205b368894b 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -662,6 +662,33 @@ EXPORT_SYMBOL(acpi_bus_unregister_driver); /* -------------------------------------------------------------------------- Device Enumeration -------------------------------------------------------------------------- */ +static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) +{ + acpi_status status; + int ret; + struct acpi_device *device; + + /* + * Fixed hardware devices do not appear in the namespace and do not + * have handles, but we fabricate acpi_devices for them, so we have + * to deal with them specially. + */ + if (handle == NULL) + return acpi_root; + + do { + status = acpi_get_parent(handle, &handle); + if (status == AE_NULL_ENTRY) + return NULL; + if (ACPI_FAILURE(status)) + return acpi_root; + + ret = acpi_bus_get_device(handle, &device); + if (ret == 0) + return device; + } while (1); +} + acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) { @@ -1217,10 +1244,9 @@ static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) return 0; } -static int -acpi_add_single_object(struct acpi_device **child, - struct acpi_device *parent, acpi_handle handle, int type, - struct acpi_bus_ops *ops) +static int acpi_add_single_object(struct acpi_device **child, + acpi_handle handle, int type, + struct acpi_bus_ops *ops) { int result; struct acpi_device *device; @@ -1234,7 +1260,7 @@ acpi_add_single_object(struct acpi_device **child, device->device_type = type; device->handle = handle; - device->parent = parent; + device->parent = acpi_bus_get_parent(handle); device->bus_ops = *ops; /* workround for not call .start */ acpi_device_get_busid(device); @@ -1434,8 +1460,8 @@ static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) } if (ops->acpi_op_add) - status = acpi_add_single_object(&child, parent, - chandle, type, ops); + status = acpi_add_single_object(&child, chandle, type, + ops); else status = acpi_bus_get_device(chandle, &child); @@ -1488,7 +1514,7 @@ acpi_bus_add(struct acpi_device **child, memset(&ops, 0, sizeof(ops)); ops.acpi_op_add = 1; - result = acpi_add_single_object(child, parent, handle, type, &ops); + result = acpi_add_single_object(child, handle, type, &ops); if (!result) result = acpi_bus_scan(*child, &ops); @@ -1584,15 +1610,13 @@ static int acpi_bus_scan_fixed(void) * Enumerate all fixed-feature devices. */ if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { - result = acpi_add_single_object(&device, acpi_root, - NULL, + result = acpi_add_single_object(&device, NULL, ACPI_BUS_TYPE_POWER_BUTTON, &ops); } if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { - result = acpi_add_single_object(&device, acpi_root, - NULL, + result = acpi_add_single_object(&device, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON, &ops); } @@ -1618,7 +1642,7 @@ int __init acpi_scan_init(void) /* * Create the root device in the bus's device tree */ - result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, + result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT, ACPI_BUS_TYPE_SYSTEM, &ops); if (result) goto Done; |