ACPICA: Disassembler: Improve pathname support for emitted External() statements.

This change adds full pathname support for external names that have been
resolved internally by the inclusion of additional ACPI tables (via the
iASL -e option). Without this change, the disassembler can emit multiple
externals for the same object, or it become confused when the Scope()
operator is used on an external object.

Linux kernel behaviour is not affected as the structure changes and the
new invocations are only used by compiler and disassembler which are
not shipped in the kernel currently.

Reported-by: Michael Tsirkin <mst@redhat.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>

3 files changed, 8 insertions, 7 deletions

diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 53ed1a8ba4f0..d95ca5449ace 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -1038,15 +1038,16 @@ struct acpi_external_list {
         struct acpi_external_list *next;
         u32 value;
         u16 length;
+        u16 flags;
         u8 type;
-        u8 flags;
-        u8 resolved;
-        u8 emitted;
 };
 
 /* Values for Flags field above */
 
-#define ACPI_IPATH_ALLOCATED    0x01
+#define ACPI_EXT_RESOLVED_REFERENCE         0x01        /* Object was resolved during cross ref */
+#define ACPI_EXT_ORIGIN_FROM_FILE           0x02        /* External came from a file */
+#define ACPI_EXT_INTERNAL_PATH_ALLOCATED    0x04        /* Deallocate internal path on completion */
+#define ACPI_EXT_EXTERNAL_EMITTED           0x08        /* External() statement has been emitted */
 
 struct acpi_external_file {
         char *path;
diff --git a/drivers/acpi/acpica/dsfield.c b/drivers/acpi/acpica/dsfield.c
index 2d4c07322576..e7a57c554e84 100644
--- a/drivers/acpi/acpica/dsfield.c
+++ b/drivers/acpi/acpica/dsfield.c
@@ -105,7 +105,7 @@ acpi_ds_create_external_region(acpi_status lookup_status,
          * operation_region not found. Generate an External for it, and
          * insert the name into the namespace.
          */
-        acpi_dm_add_to_external_list(op, path, ACPI_TYPE_REGION, 0);
+        acpi_dm_add_op_to_external_list(op, path, ACPI_TYPE_REGION, 0, 0);
         status = acpi_ns_lookup(walk_state->scope_info, path, ACPI_TYPE_REGION,
                                 ACPI_IMODE_LOAD_PASS1, ACPI_NS_SEARCH_PARENT,
                                 walk_state, node);
diff --git a/drivers/acpi/acpica/dswload.c b/drivers/acpi/acpica/dswload.c
index 95e681a36f9c..2dbe109727c8 100644
--- a/drivers/acpi/acpica/dswload.c
+++ b/drivers/acpi/acpica/dswload.c
@@ -181,8 +181,8 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
                          * Target of Scope() not found. Generate an External for it, and
                          * insert the name into the namespace.
                          */
-                        acpi_dm_add_to_external_list(op, path, ACPI_TYPE_DEVICE,
-                                                     0);
+                        acpi_dm_add_op_to_external_list(op, path,
+                                                        ACPI_TYPE_DEVICE, 0, 0);
                         status =
                             acpi_ns_lookup(walk_state->scope_info, path,
                                            object_type, ACPI_IMODE_LOAD_PASS1,