ACPICA: Delete recursive feature of ACPI Global Lock

Completed a new design and implementation for
the ACPI Global Lock support. On the OS side, the global
lock is now treated as a standard AML mutex. Previously,
multiple OS threads could acquire the global lock
simultaneously, but this could cause the BIOS to be starved
by the lock in cases such as the Embedded Controller driver,
where there is a tight coupling between the OS and the BIOS.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 77 deletions

diff --git a/drivers/acpi/executer/exsystem.c b/drivers/acpi/executer/exsystem.c
index 28aef3e69ecc..3b9736a3e1b7 100644
--- a/drivers/acpi/executer/exsystem.c
+++ b/drivers/acpi/executer/exsystem.c
@@ -227,82 +227,6 @@ acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_ex_system_acquire_mutex
- *
- * PARAMETERS:  time_desc       - Maximum time to wait for the mutex
- *              obj_desc        - The object descriptor for this op
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Provides an access point to perform synchronization operations
- *              within the AML.  This function will cause a lock to be generated
- *              for the Mutex pointed to by obj_desc.
- *
- ******************************************************************************/
-
-acpi_status
-acpi_ex_system_acquire_mutex(union acpi_operand_object * time_desc,
-                             union acpi_operand_object * obj_desc)
-{
-        acpi_status status = AE_OK;
-
-        ACPI_FUNCTION_TRACE_PTR(ex_system_acquire_mutex, obj_desc);
-
-        if (!obj_desc) {
-                return_ACPI_STATUS(AE_BAD_PARAMETER);
-        }
-
-        /* Support for the _GL_ Mutex object -- go get the global lock */
-
-        if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
-                status =
-                    acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
-                return_ACPI_STATUS(status);
-        }
-
-        status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
-                                           (u16) time_desc->integer.value);
-        return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_ex_system_release_mutex
- *
- * PARAMETERS:  obj_desc        - The object descriptor for this op
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Provides an access point to perform synchronization operations
- *              within the AML.  This operation is a request to release a
- *              previously acquired Mutex.  If the Mutex variable is set then
- *              it will be decremented.
- *
- ******************************************************************************/
-
-acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc)
-{
-        acpi_status status = AE_OK;
-
-        ACPI_FUNCTION_TRACE(ex_system_release_mutex);
-
-        if (!obj_desc) {
-                return_ACPI_STATUS(AE_BAD_PARAMETER);
-        }
-
-        /* Support for the _GL_ Mutex object -- release the global lock */
-
-        if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
-                status = acpi_ev_release_global_lock();
-                return_ACPI_STATUS(status);
-        }
-
-        acpi_os_release_mutex(obj_desc->mutex.os_mutex);
-        return_ACPI_STATUS(AE_OK);
-}
-
-/*******************************************************************************
- *
  * FUNCTION:    acpi_ex_system_signal_event
  *
  * PARAMETERS:  obj_desc        - The object descriptor for this op
@@ -314,7 +238,7 @@ acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc)
  *
  ******************************************************************************/
 
-acpi_status acpi_ex_system_signal_event(union acpi_operand_object *obj_desc)
+acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
 {
         acpi_status status = AE_OK;