diff options
Diffstat (limited to 'drivers/acpi/executer/exmutex.c')
| -rw-r--r-- | drivers/acpi/executer/exmutex.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c index b8d035c00b6..7c70938eef8 100644 --- a/drivers/acpi/executer/exmutex.c +++ b/drivers/acpi/executer/exmutex.c @@ -85,6 +85,7 @@ void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc) } else { thread->acquired_mutex_list = obj_desc->mutex.next; } + return; } /******************************************************************************* @@ -298,6 +299,17 @@ acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc) return (AE_NOT_ACQUIRED); } + /* No obj_desc->Mutex.owner_thread for Global Lock */ + + /* + * Mutex to be released must be at the head of acquired list to prevent + * deadlock. (The head of the list is the last mutex acquired.) + */ + if (obj_desc->mutex.owner_thread && + (obj_desc != obj_desc->mutex.owner_thread->acquired_mutex_list)) { + return (AE_AML_MUTEX_ORDER); + } + /* Match multiple Acquires with multiple Releases */ obj_desc->mutex.acquisition_depth--; @@ -403,6 +415,9 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc, } status = acpi_ex_release_mutex_object(obj_desc); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } if (obj_desc->mutex.acquisition_depth == 0) { @@ -411,6 +426,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc, walk_state->thread->current_sync_level = obj_desc->mutex.original_sync_level; } + return_ACPI_STATUS(status); } |