ACPICA: Add support to externally execute _OSI method

The current implemenation of _OSI within ACPICA only allows other
control methods to execute _OSI. This change allows the host
OS to execute _OSI via the AcpiEvaluateObject interface. _OSI
is a special method -- it does not exist in the AML code, it is
implemented within ACPICA.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 27 insertions, 3 deletions

diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
index 279a5a60a0dd..77b7039a26e4 100644
--- a/drivers/acpi/dispatcher/dsmethod.c
+++ b/drivers/acpi/dispatcher/dsmethod.c
@@ -412,6 +412,9 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 
         if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
                 status = obj_desc->method.implementation(next_walk_state);
+                if (status == AE_OK) {
+                        status = AE_CTRL_TERMINATE;
+                }
         }
 
         return_ACPI_STATUS(status);
diff --git a/drivers/acpi/parser/psparse.c b/drivers/acpi/parser/psparse.c
index dfd3d9028018..5156203883d7 100644
--- a/drivers/acpi/parser/psparse.c
+++ b/drivers/acpi/parser/psparse.c
@@ -447,6 +447,10 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
                           walk_state, walk_state->parser_state.aml,
                           walk_state->parser_state.aml_size));
 
+        if (!walk_state->parser_state.aml) {
+                return_ACPI_STATUS(AE_NULL_OBJECT);
+        }
+
         /* Create and initialize a new thread state */
 
         thread = acpi_ut_create_thread_state();
diff --git a/drivers/acpi/parser/psxface.c b/drivers/acpi/parser/psxface.c
index 270469aae842..4985ce58c024 100644
--- a/drivers/acpi/parser/psxface.c
+++ b/drivers/acpi/parser/psxface.c
@@ -45,6 +45,7 @@
 #include <acpi/acparser.h>
 #include <acpi/acdispat.h>
 #include <acpi/acinterp.h>
+#include <acpi/amlcode.h>
 
 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psxface")
@@ -278,6 +279,22 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
                 goto cleanup;
         }
 
+        /* Invoke an internal method if necessary */
+
+        if (info->obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
+                status = info->obj_desc->method.implementation(walk_state);
+                info->return_object = walk_state->return_desc;
+
+                /* Cleanup states */
+
+                acpi_ds_scope_stack_clear(walk_state);
+                acpi_ps_cleanup_scope(&walk_state->parser_state);
+                acpi_ds_terminate_control_method(walk_state->method_desc,
+                                                 walk_state);
+                acpi_ds_delete_walk_state(walk_state);
+                goto cleanup;
+        }
+
         /* Parse the AML */
 
         status = acpi_ps_parse_aml(walk_state);
diff --git a/drivers/acpi/utilities/uteval.c b/drivers/acpi/utilities/uteval.c
index 352747e49c7a..df2b511b595a 100644
--- a/drivers/acpi/utilities/uteval.c
+++ b/drivers/acpi/utilities/uteval.c
@@ -129,7 +129,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
                         /* The interface is supported */
 
-                        return_ACPI_STATUS(AE_CTRL_TERMINATE);
+                        return_ACPI_STATUS(AE_OK);
                 }
         }
 
@@ -143,13 +143,13 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
                 /* The interface is supported */
 
-                return_ACPI_STATUS(AE_CTRL_TERMINATE);
+                return_ACPI_STATUS(AE_OK);
         }
 
         /* The interface is not supported */
 
         return_desc->integer.value = 0;
-        return_ACPI_STATUS(AE_CTRL_TERMINATE);
+        return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************