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    Subject[ 55/68] ACPICA: Fix to allow region arguments to reference other scopes
    3.2-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Lin Ming <ming.m.lin@intel.com>

    commit 8931d9ea78848b073bf299594f148b83abde4a5e upstream.

    Allow referenced objects to be in a different scope.

    http://www.acpica.org/bugzilla/show_bug.cgi?id=937
    http://marc.info/?l=linux-acpi&m=131636632718222&w=2

    ACPI Error: [RAMB] Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)
    ACPI Exception: AE_NOT_FOUND, Could not execute arguments for [RAMW] (Region) (20110112/nsinit-349)

    Scope (_SB)
    {
    Name (RAMB, 0xDF5A1018)
    OperationRegion (\RAMW, SystemMemory, RAMB, 0x00010000)
    }

    For above ASL code, we need to save scope node(\_SB) to lookup
    the argument node(\_SB.RAMB).

    Reported-by: Jim Green <student.northwestern@gmail.com>
    Signed-off-by: Lin Ming <ming.m.lin@intel.com>
    Signed-off-by: Bob Moore <robert.moore@intel.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    Cc: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/acpi/acpica/acobject.h | 1 +
    drivers/acpi/acpica/dsargs.c | 2 +-
    drivers/acpi/acpica/excreate.c | 6 ++++++
    3 files changed, 8 insertions(+), 1 deletion(-)

    --- a/drivers/acpi/acpica/acobject.h
    +++ b/drivers/acpi/acpica/acobject.h
    @@ -358,6 +358,7 @@ typedef enum {
    */
    struct acpi_object_extra {
    ACPI_OBJECT_COMMON_HEADER struct acpi_namespace_node *method_REG; /* _REG method for this region (if any) */
    + struct acpi_namespace_node *scope_node;
    void *region_context; /* Region-specific data */
    u8 *aml_start;
    u32 aml_length;
    --- a/drivers/acpi/acpica/dsargs.c
    +++ b/drivers/acpi/acpica/dsargs.c
    @@ -384,7 +384,7 @@ acpi_status acpi_ds_get_region_arguments

    /* Execute the argument AML */

    - status = acpi_ds_execute_arguments(node, node->parent,
    + status = acpi_ds_execute_arguments(node, extra_desc->extra.scope_node,
    extra_desc->extra.aml_length,
    extra_desc->extra.aml_start);
    if (ACPI_FAILURE(status)) {
    --- a/drivers/acpi/acpica/excreate.c
    +++ b/drivers/acpi/acpica/excreate.c
    @@ -330,6 +330,12 @@ acpi_ex_create_region(u8 * aml_start,
    region_obj2 = obj_desc->common.next_object;
    region_obj2->extra.aml_start = aml_start;
    region_obj2->extra.aml_length = aml_length;
    + if (walk_state->scope_info) {
    + region_obj2->extra.scope_node =
    + walk_state->scope_info->scope.node;
    + } else {
    + region_obj2->extra.scope_node = node;
    + }

    /* Init the region from the operands */




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