ACPICA: Enable Scope change to root during module-level code execution.

Allows constructs like this:
    If (XXXX)
        Scope (\)
        ...

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/dswload.c b/drivers/acpi/acpica/dswload.c
index 552aa3a50c84..557510084c7a 100644
--- a/drivers/acpi/acpica/dswload.c
+++ b/drivers/acpi/acpica/dswload.c
@@ -230,6 +230,20 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
                         break;
 
+                case ACPI_TYPE_METHOD:
+
+                        /*
+                         * Allow scope change to root during execution of module-level
+                         * code. Root is typed METHOD during this time.
+                         */
+                        if ((node == acpi_gbl_root_node) &&
+                            (walk_state->
+                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
+                                break;
+                        }
+
+                        /*lint -fallthrough */
+
                 default:
 
                         /* All other types are an error */
diff --git a/drivers/acpi/acpica/dswload2.c b/drivers/acpi/acpica/dswload2.c
index ae7147724763..89c0114210c0 100644
--- a/drivers/acpi/acpica/dswload2.c
+++ b/drivers/acpi/acpica/dswload2.c
@@ -230,6 +230,20 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
                         walk_state->scope_info->common.value = ACPI_TYPE_ANY;
                         break;
 
+                case ACPI_TYPE_METHOD:
+
+                        /*
+                         * Allow scope change to root during execution of module-level
+                         * code. Root is typed METHOD during this time.
+                         */
+                        if ((node == acpi_gbl_root_node) &&
+                            (walk_state->
+                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
+                                break;
+                        }
+
+                        /*lint -fallthrough */
+
                 default:
 
                         /* All other types are an error */