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ACPICA: Disassembler: create buffer fields in ACPI_PARSE_LOAD_PASS1 

ACPICA commit 29cc8dbc5463a93625bed87d7550a8bed8913bf4

create_buffer_field is a deferred op that is typically processed in
load pass 2. However, disassembly of control method contents walk the
parse tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are
processed in a later walk. This is a problem when there is a control
method that has the same name as the AML_CREATE object. In this case,
any use of the name segment will be detected as a method call rather
than a reference to a buffer field. If this is detected as a method
call, it can result in a mal-formed parse tree if the control methods
have parameters.

This change in processing AML_CREATE ops earlier solves this issue by
inserting the named object in the ACPI namespace so that references
to this name would be detected as a name string rather than a method
call.

Link: https://github.com/acpica/acpica/commit/29cc8dbc
Reported-by: Elia Geretto <elia.f.geretto@gmail.com>
Tested-by: Elia Geretto <elia.f.geretto@gmail.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
alistair/sensors
Erik Kaneda 2019-12-17 11:35:20 -08:00 committed by Rafael J. Wysocki
parent 22e38ca735
commit 5ddbd77181
2 changed files with 22 additions and 1 deletions
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2
drivers/acpi/acpica/dsfield.c
View File

@ -243,7 +243,7 @@ cleanup:
* FUNCTION: acpi_ds_get_field_names
*
* PARAMETERS: info - create_field info structure
* ` walk_state - Current method state
* walk_state - Current method state
* arg - First parser arg for the field name list
*
* RETURN: Status

21
drivers/acpi/acpica/dswload.c
View File

@ -410,6 +410,27 @@ acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
walk_state));
/*
* Disassembler: handle create field operators here.
*
* create_buffer_field is a deferred op that is typically processed in load
* pass 2. However, disassembly of control method contents walk the parse
* tree with ACPI_PARSE_LOAD_PASS1 and AML_CREATE operators are processed
* in a later walk. This is a problem when there is a control method that
* has the same name as the AML_CREATE object. In this case, any use of the
* name segment will be detected as a method call rather than a reference
* to a buffer field.
*
* This earlier creation during disassembly solves this issue by inserting
* the named object in the ACPI namespace so that references to this name
* would be a name string rather than a method call.
*/
if ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) &&
(walk_state->op_info->flags & AML_CREATE)) {
status = acpi_ds_create_buffer_field(op, walk_state);
return_ACPI_STATUS(status);
}
/* We are only interested in opcodes that have an associated name */
if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {