ACPICA: Events: Fix acpi_ev_initialize_region() return value

ACPICA commit 543342ab7a676f4eb0c9f100d349388a84dff0e8

This patch changes acpi_ev_initialize_region(), stop returning AE_NOT_EXIST
from it so that, not only in acpi_ds_load2_end_op(), but all places invoking
this function won't emit exceptions. The exception can be seen in
acpi_ds_initialize_objects() when certain table loading mode is chosen.

This patch also removes useless acpi_ns_locked from acpi_ev_initialize_region()
as this function will always be invoked with interpreter lock held now, and
the lock granularity has been tuned to lock around _REG execution, thus it
is now handled by acpi_ex_exit_interpreter(). Lv Zheng.

Link: https://github.com/acpica/acpica/commit/543342ab
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

4 files changed, 27 insertions, 51 deletions

diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 92fa47c6498c..8a0049d5cdf3 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -243,9 +243,7 @@ acpi_ev_default_region_setup(acpi_handle handle,
                              u32 function,
                              void *handler_context, void **region_context);
 
-acpi_status
-acpi_ev_initialize_region(union acpi_operand_object *region_obj,
-                          u8 acpi_ns_locked);
+acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj);
 
 /*
  * evsci - SCI (System Control Interrupt) handling/dispatch
diff --git a/drivers/acpi/acpica/dsopcode.c b/drivers/acpi/acpica/dsopcode.c
index 4cc9d989a114..77fd7c84ec39 100644
--- a/drivers/acpi/acpica/dsopcode.c
+++ b/drivers/acpi/acpica/dsopcode.c
@@ -84,7 +84,7 @@ acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
 
         /* Namespace is NOT locked */
 
-        status = acpi_ev_initialize_region(obj_desc, FALSE);
+        status = acpi_ev_initialize_region(obj_desc);
         return (status);
 }
 
diff --git a/drivers/acpi/acpica/dswload2.c b/drivers/acpi/acpica/dswload2.c
index e36218206bb0..651f35a66cc2 100644
--- a/drivers/acpi/acpica/dswload2.c
+++ b/drivers/acpi/acpica/dswload2.c
@@ -609,18 +609,7 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 
                         status =
                             acpi_ev_initialize_region
-                            (acpi_ns_get_attached_object(node), FALSE);
-
-                        if (ACPI_FAILURE(status)) {
-                                /*
-                                 *  If AE_NOT_EXIST is returned, it is not fatal
-                                 *  because many regions get created before a handler
-                                 *  is installed for said region.
-                                 */
-                                if (AE_NOT_EXIST == status) {
-                                        status = AE_OK;
-                                }
-                        }
+                            (acpi_ns_get_attached_object(node));
                         break;
 
                 case AML_NAME_OP:
diff --git a/drivers/acpi/acpica/evrgnini.c b/drivers/acpi/acpica/evrgnini.c
index 75ddd160a716..a9092251ce80 100644
--- a/drivers/acpi/acpica/evrgnini.c
+++ b/drivers/acpi/acpica/evrgnini.c
@@ -479,7 +479,6 @@ acpi_ev_default_region_setup(acpi_handle handle,
  * FUNCTION:    acpi_ev_initialize_region
  *
  * PARAMETERS:  region_obj      - Region we are initializing
- *              acpi_ns_locked  - Is namespace locked?
  *
  * RETURN:      Status
  *
@@ -497,19 +496,28 @@ acpi_ev_default_region_setup(acpi_handle handle,
  * MUTEX:       Interpreter should be unlocked, because we may run the _REG
  *              method for this region.
  *
+ * NOTE:        Possible incompliance:
+ *              There is a behavior conflict in automatic _REG execution:
+ *              1. When the interpreter is evaluating a method, we can only
+ *                 automatically run _REG for the following case:
+ *                   operation_region (OPR1, 0x80, 0x1000010, 0x4)
+ *              2. When the interpreter is loading a table, we can also
+ *                 automatically run _REG for the following case:
+ *                   operation_region (OPR1, 0x80, 0x1000010, 0x4)
+ *              Though this may not be compliant to the de-facto standard, the
+ *              logic is kept in order not to trigger regressions. And keeping
+ *              this logic should be taken care by the caller of this function.
+ *
  ******************************************************************************/
 
-acpi_status
-acpi_ev_initialize_region(union acpi_operand_object *region_obj,
-                          u8 acpi_ns_locked)
+acpi_status acpi_ev_initialize_region(union acpi_operand_object *region_obj)
 {
         union acpi_operand_object *handler_obj;
         union acpi_operand_object *obj_desc;
         acpi_adr_space_type space_id;
         struct acpi_namespace_node *node;
-        acpi_status status;
 
-        ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);
+        ACPI_FUNCTION_TRACE(ev_initialize_region);
 
         if (!region_obj) {
                 return_ACPI_STATUS(AE_BAD_PARAMETER);
@@ -580,39 +588,17 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
                                                   handler_obj, region_obj,
                                                   obj_desc));
 
-                                status =
-                                    acpi_ev_attach_region(handler_obj,
-                                                          region_obj,
-                                                          acpi_ns_locked);
+                                (void)acpi_ev_attach_region(handler_obj,
+                                                            region_obj, FALSE);
 
                                 /*
                                  * Tell all users that this region is usable by
                                  * running the _REG method
                                  */
-                                if (acpi_ns_locked) {
-                                        status =
-                                            acpi_ut_release_mutex
-                                            (ACPI_MTX_NAMESPACE);
-                                        if (ACPI_FAILURE(status)) {
-                                                return_ACPI_STATUS(status);
-                                        }
-                                }
-
                                 acpi_ex_exit_interpreter();
-                                status =
-                                    acpi_ev_execute_reg_method(region_obj,
-                                                               ACPI_REG_CONNECT);
+                                (void)acpi_ev_execute_reg_method(region_obj,
+                                                                 ACPI_REG_CONNECT);
                                 acpi_ex_enter_interpreter();
-
-                                if (acpi_ns_locked) {
-                                        status =
-                                            acpi_ut_acquire_mutex
-                                            (ACPI_MTX_NAMESPACE);
-                                        if (ACPI_FAILURE(status)) {
-                                                return_ACPI_STATUS(status);
-                                        }
-                                }
-
                                 return_ACPI_STATUS(AE_OK);
                         }
                 }
@@ -622,12 +608,15 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
                 node = node->parent;
         }
 
-        /* If we get here, there is no handler for this region */
-
+        /*
+         * If we get here, there is no handler for this region. This is not
+         * fatal because many regions get created before a handler is installed
+         * for said region.
+         */
         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                           "No handler for RegionType %s(%X) (RegionObj %p)\n",
                           acpi_ut_get_region_name(space_id), space_id,
                           region_obj));
 
-        return_ACPI_STATUS(AE_NOT_EXIST);
+        return_ACPI_STATUS(AE_OK);
 }