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ACPICA: Fix allowable release order for ASL mutex objects 

The ACPI 4.0 specification has been changed to make the SyncLevel
for mutex objects more useful. When releasing a mutex, the
synclevel of the mutex must now be the same as the current sync
level. This makes more sense. This change updates the code to
match the spec.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2009-05-21 10:04:33 +08:00 committed by Len Brown
parent 10a3b461a2
commit 315c728887
1 changed files with 11 additions and 4 deletions
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15
drivers/acpi/acpica/exmutex.c
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@ -402,10 +402,14 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
}
/*
* The sync level of the mutex must be less than or equal to the current
* sync level
* The sync level of the mutex must be equal to the current sync level. In
* other words, the current level means that at least one mutex at that
* level is currently being held. Attempting to release a mutex of a
* different level can only mean that the mutex ordering rule is being
* violated. This behavior is clarified in ACPI 4.0 specification.
*/
if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
if (obj_desc->mutex.sync_level !=
walk_state->thread->current_sync_level) {
ACPI_ERROR((AE_INFO,
"Cannot release Mutex [%4.4s], SyncLevel mismatch: mutex %d current %d",
acpi_ut_get_node_name(obj_desc->mutex.node),
@ -423,10 +427,13 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
walk_state->thread->acquired_mutex_list->mutex.original_sync_level;
status = acpi_ex_release_mutex_object(obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (obj_desc->mutex.acquisition_depth == 0) {
/* Restore the original sync_level */
/* Restore the previous sync_level */
walk_state->thread->current_sync_level = previous_sync_level;
}