diff options
| author | Bob Moore <robert.moore@intel.com> | 2007-02-02 16:48:18 (GMT) |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-02-03 02:14:20 (GMT) |
| commit | c81da66608d65dab04730582dfdfcdcab779e2fe (patch) | |
| tree | e1d2936a457d3ac2b359b4fc676bedfd341fee86 /drivers/acpi/utilities | |
| parent | 8f9337c88335846b01801b1047a4caf10527a320 (diff) | |
| download | linux-fsl-qoriq-c81da66608d65dab04730582dfdfcdcab779e2fe.tar.xz | |
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>
Diffstat (limited to 'drivers/acpi/utilities')
| -rw-r--r-- | drivers/acpi/utilities/utdelete.c | 14 | ||||
| -rw-r--r-- | drivers/acpi/utilities/utglobal.c | 2 |
2 files changed, 10 insertions, 6 deletions
diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c index 9d3f114..af8e65f 100644 --- a/drivers/acpi/utilities/utdelete.c +++ b/drivers/acpi/utilities/utdelete.c @@ -158,16 +158,20 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) "***** Mutex %p, OS Mutex %p\n", object, object->mutex.os_mutex)); - if (object->mutex.os_mutex != ACPI_GLOBAL_LOCK) { - acpi_ex_unlink_mutex(object); - acpi_os_delete_mutex(object->mutex.os_mutex); - } else { - /* Global Lock "mutex" is actually a counting semaphore */ + if (object->mutex.os_mutex == acpi_gbl_global_lock_mutex) { + + /* Global Lock has extra semaphore */ (void) acpi_os_delete_semaphore (acpi_gbl_global_lock_semaphore); acpi_gbl_global_lock_semaphore = NULL; + + acpi_os_delete_mutex(object->mutex.os_mutex); + acpi_gbl_global_lock_mutex = NULL; + } else { + acpi_ex_unlink_mutex(object); + acpi_os_delete_mutex(object->mutex.os_mutex); } break; diff --git a/drivers/acpi/utilities/utglobal.c b/drivers/acpi/utilities/utglobal.c index 014030a..1038452 100644 --- a/drivers/acpi/utilities/utglobal.c +++ b/drivers/acpi/utilities/utglobal.c @@ -795,8 +795,8 @@ void acpi_ut_init_globals(void) /* Global Lock support */ acpi_gbl_global_lock_semaphore = NULL; + acpi_gbl_global_lock_mutex = NULL; acpi_gbl_global_lock_acquired = FALSE; - acpi_gbl_global_lock_thread_count = 0; acpi_gbl_global_lock_handle = 0; /* Miscellaneous variables */ |