acpi_ex_system_wait_mutex
acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout);
acpi_ex_system_wait_mutex(obj_desc->method.mutex->
acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex->mutex.
acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,