ACPICA: Debugger: Fix "terminate" command by cleaning up subsystem shutdown logic

ACPICA commit 7e823714911480be47e310fb1b3590d289b9fd99

Segmentation fault can be seen for executing the "terminate" command. This
is because acpi_ut_subsystem_shutdown() is errnously called multiple times.

This patch cleans up acpi_ut_subsystem_shutdown() logics to fix this
issue. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/7e823714
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>

3 files changed, 15 insertions, 14 deletions

diff --git a/drivers/acpi/acpica/dbinput.c b/drivers/acpi/acpica/dbinput.c
index f8cddd682af2..0480254437f1 100644
--- a/drivers/acpi/acpica/dbinput.c
+++ b/drivers/acpi/acpica/dbinput.c
@@ -1074,6 +1074,7 @@ acpi_db_command_dispatch(char *input_buffer,
                  * re-creating the semaphores!
                  */
 
+                acpi_gbl_db_terminate_loop = TRUE;
                 /*  acpi_initialize (NULL); */
                 break;
 
@@ -1151,7 +1152,7 @@ void ACPI_SYSTEM_XFACE acpi_db_execute_thread(void *context)
         acpi_status status = AE_OK;
         acpi_status Mstatus;
 
-        while (status != AE_CTRL_TERMINATE) {
+        while (status != AE_CTRL_TERMINATE && !acpi_gbl_db_terminate_loop) {
                 acpi_gbl_method_executing = FALSE;
                 acpi_gbl_step_to_next_call = FALSE;
 
diff --git a/drivers/acpi/acpica/utinit.c b/drivers/acpi/acpica/utinit.c
index d8699df8914c..ccd0745f011e 100644
--- a/drivers/acpi/acpica/utinit.c
+++ b/drivers/acpi/acpica/utinit.c
@@ -282,6 +282,19 @@ void acpi_ut_subsystem_shutdown(void)
 {
         ACPI_FUNCTION_TRACE(ut_subsystem_shutdown);
 
+        /* Just exit if subsystem is already shutdown */
+
+        if (acpi_gbl_shutdown) {
+                ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
+                return_VOID;
+        }
+
+        /* Subsystem appears active, go ahead and shut it down */
+
+        acpi_gbl_shutdown = TRUE;
+        acpi_gbl_startup_flags = 0;
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
+
 #ifndef ACPI_ASL_COMPILER
 
         /* Close the acpi_event Handling */
diff --git a/drivers/acpi/acpica/utxface.c b/drivers/acpi/acpica/utxface.c
index f183daf938b7..a6b0eb034fc0 100644
--- a/drivers/acpi/acpica/utxface.c
+++ b/drivers/acpi/acpica/utxface.c
@@ -67,19 +67,6 @@ acpi_status __init acpi_terminate(void)
 
         ACPI_FUNCTION_TRACE(acpi_terminate);
 
-        /* Just exit if subsystem is already shutdown */
-
-        if (acpi_gbl_shutdown) {
-                ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
-                return_ACPI_STATUS(AE_OK);
-        }
-
-        /* Subsystem appears active, go ahead and shut it down */
-
-        acpi_gbl_shutdown = TRUE;
-        acpi_gbl_startup_flags = 0;
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
-
         /* Shutdown and free all resources */
 
         acpi_ut_subsystem_shutdown();