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ACPICA: Fix for Alias operator to see target child objects

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Fixed a problem with the Alias operator when the target of the
alias is a named ASL operator that opens a new scope -- Scope,
Device, PowerResource, Processor, and ThermalZone. In these cases,
any children of the original operator could not be accessed via
the alias, potentially causing unexpected AE_NOT_FOUND exceptions.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2008-04-10 19:06:39 +04:00 committed by Len Brown
parent 1c12a7dde1
commit 53cf174409
2 changed files with 74 additions and 40 deletions
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20
drivers/acpi/executer/excreate.c
View file

@ -96,16 +96,28 @@ acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
* to the original 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:
/*
* These types open a new scope, so we need the NS node in order to access
* any children.
*/
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_POWER:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_LOCAL_SCOPE:
/*
* The new alias has the type ALIAS and points to the original
* NS node, not the object itself. This is because for these
* types, the object can change dynamically via a Store.
* NS node, not the object itself.
*/
alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
alias_node->object =
@ -115,9 +127,7 @@ acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
case ACPI_TYPE_METHOD:
/*
* The new alias has the type ALIAS and points to the original
* NS node, not the object itself. This is because for these
* types, the object can change dynamically via a Store.
* Control method aliases need to be differentiated
*/
alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
alias_node->object =

42
drivers/acpi/namespace/nsaccess.c
View file

@ -581,6 +581,29 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
return_ACPI_STATUS(status);
}
/* More segments to follow? */
if (num_segments > 0) {
/*
* If we have an alias to an object that opens a scope (such as a
* device or processor), we need to dereference the alias here so that
* we can access any children of the original node (via the remaining
* segments).
*/
if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
if (acpi_ns_opens_scope
(((struct acpi_namespace_node *)this_node->
object)->type)) {
this_node =
(struct acpi_namespace_node *)
this_node->object;
}
}
}
/* Special handling for the last segment (num_segments == 0) */
else {
/*
* Sanity typecheck of the target object:
*
@ -594,20 +617,20 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
*
* Then we have a type mismatch. Just warn and ignore it.
*/
if ((num_segments == 0) &&
(type_to_check_for != ACPI_TYPE_ANY) &&
if ((type_to_check_for != ACPI_TYPE_ANY) &&
(type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
(type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
(type_to_check_for != ACPI_TYPE_LOCAL_SCOPE) &&
(this_node->type != ACPI_TYPE_ANY) &&
(this_node->type != type_to_check_for)) {
(type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
&& (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
&& (this_node->type != ACPI_TYPE_ANY)
&& (this_node->type != type_to_check_for)) {
/* Complain about a type mismatch */
ACPI_WARNING((AE_INFO,
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
ACPI_CAST_PTR(char, &simple_name),
acpi_ut_get_type_name(this_node->type),
acpi_ut_get_type_name(this_node->
type),
acpi_ut_get_type_name
(type_to_check_for)));
}
@ -615,11 +638,12 @@ acpi_ns_lookup(union acpi_generic_state *scope_info,
/*
* If this is the last name segment and we are not looking for a
* specific type, but the type of found object is known, use that type
* to see if it opens a scope.
* to (later) see if it opens a scope.
*/
if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) {
if (type == ACPI_TYPE_ANY) {
type = this_node->type;
}
}
/* Point to next name segment and make this node current */