ACPICA: Disassembler: prevent external op's from opening a new scope

ACPICA commit c512c2bfcce65b8e8f37d549ac2fa4a1e0182e46

Since Externals could be of ACPI_TYPE_METHOD, there is a possibility
that the acpi_ns_lookup may cause a new scope to be opened. Therefore,
disable opening the scope for all acpi_ns_lookup invocations that deal
with externals.

Link: https://github.com/acpica/acpica/commit/c512c2bf
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
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>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/dswload2.c b/drivers/acpi/acpica/dswload2.c
index 8d510c7e20c8..ab5d318975f4 100644
--- a/drivers/acpi/acpica/dswload2.c
+++ b/drivers/acpi/acpica/dswload2.c
@@ -310,6 +310,16 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
                                 flags |= ACPI_NS_TEMPORARY;
                         }
                 }
+#ifdef ACPI_ASL_COMPILER
+
+                /*
+                 * Do not open a scope. This could be an external method
+                 * and open a scope.
+                 */
+                if (walk_state->opcode == AML_EXTERNAL_OP) {
+                        flags |= ACPI_NS_DONT_OPEN_SCOPE;
+                }
+#endif
 
                 /* Add new entry or lookup existing entry */