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ACPICA: Interpreter: Update handling for Alias operator

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ACPICA commit 719d0bdd48e3e8e7a62a86c04922b9f41da6def0

Provide common creation code for the Alias operator. All objects
are now handled the same, with the only exception being the
Method() operator. It has a special internal Alias type.

Link: https://github.com/acpica/acpica/commit/719d0bdd
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bob Moore 2017-08-03 14:27:09 +08:00 committed by Rafael J. Wysocki
parent 3958168fc8
commit a5b6e982fb
1 changed files with 14 additions and 47 deletions
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61
drivers/acpi/acpica/excreate.c
View file

@ -88,36 +88,26 @@ acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
}
/* Ensure that the target node is valid */
if (!target_node) {
return_ACPI_STATUS(AE_NULL_OBJECT);
}
/*
* For objects that can never change (i.e., the NS node will
* permanently point to the same object), we can simply attach
* the object to the new NS node. For other objects (such as
* Integers, buffers, etc.), we have to point the Alias node
* to the original Node.
*/
/* Construct the alias object (a namespace node) */
switch (target_node->type) {
/* For these types, the sub-object can change dynamically via a Store */
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_STRING:
case ACPI_TYPE_BUFFER:
case ACPI_TYPE_PACKAGE:
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_METHOD:
/*
* These types open a new scope, so we need the NS node in order to access
* any children.
* Control method aliases need to be differentiated with
* a special type
*/
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_POWER:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_LOCAL_SCOPE:
alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
break;
default:
/*
* All other object types.
*
* The new alias has the type ALIAS and points to the original
* NS node, not the object itself.
*/
@ -125,35 +115,12 @@ acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
alias_node->object =
ACPI_CAST_PTR(union acpi_operand_object, target_node);
break;
case ACPI_TYPE_METHOD:
/*
* Control method aliases need to be differentiated
*/
alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
alias_node->object =
ACPI_CAST_PTR(union acpi_operand_object, target_node);
break;
default:
/* Attach the original source object to the new Alias Node */
/*
* The new alias assumes the type of the target, and it points
* to the same object. The reference count of the object has an
* additional reference to prevent deletion out from under either the
* target node or the alias Node
*/
status = acpi_ns_attach_object(alias_node,
acpi_ns_get_attached_object
(target_node),
target_node->type);
break;
}
/* Since both operands are Nodes, we don't need to delete them */
alias_node->object =
ACPI_CAST_PTR(union acpi_operand_object, target_node);
return_ACPI_STATUS(status);
}