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ACPICA: fix AML mutex re-entrancy

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ACPI AML supports "serialized" methods which are protected
by an implicit mutex.  The mutex is re-entrant for that AML thread
to allow recursion.

However, Linux implements notify() by creating a new AML thread.
So for systems where notify() re-enters a serialized method,
deadlock results.

The fix is to use the Linux thread_id as the key to allowing
re-entrancy, not the AML thread pointer.

http://bugzilla.kernel.org/show_bug.cgi?id=5534

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alexey Starikovskiy
2007-02-15 16:12:23 -05:00
committed by Len Brown
parent 724339d76d
commit c0d127b569
6 changed files with 25 additions and 31 deletions
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36
drivers/acpi/executer/exmutex.c
View File

@ -66,10 +66,9 @@ acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
*
******************************************************************************/
void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc,
struct acpi_thread_state *thread)
{
struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
if (!thread) {
return;
}
@ -174,16 +173,13 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
/* Support for multiple acquires by the owning thread */
if (obj_desc->mutex.owner_thread) {
if (obj_desc->mutex.owner_thread->thread_id ==
walk_state->thread->thread_id) {
/*
* The mutex is already owned by this thread, just increment the
* acquisition depth
*/
obj_desc->mutex.acquisition_depth++;
return_ACPI_STATUS(AE_OK);
}
if (obj_desc->mutex.owner_thread_id == acpi_os_get_thread_id()) {
/*
* The mutex is already owned by this thread, just increment the
* acquisition depth
*/
obj_desc->mutex.acquisition_depth++;
return_ACPI_STATUS(AE_OK);
}
/* Acquire the mutex, wait if necessary. Special case for Global Lock */
@ -206,7 +202,7 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
/* Have the mutex: update mutex and walk info and save the sync_level */
obj_desc->mutex.owner_thread = walk_state->thread;
obj_desc->mutex.owner_thread_id = acpi_os_get_thread_id();
obj_desc->mutex.acquisition_depth = 1;
obj_desc->mutex.original_sync_level =
walk_state->thread->current_sync_level;
@ -246,7 +242,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
/* The mutex must have been previously acquired in order to release it */
if (!obj_desc->mutex.owner_thread) {
if (!obj_desc->mutex.owner_thread_id) {
ACPI_ERROR((AE_INFO,
"Cannot release Mutex [%4.4s], not acquired",
acpi_ut_get_node_name(obj_desc->mutex.node)));
@ -266,14 +262,14 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
* The Mutex is owned, but this thread must be the owner.
* Special case for Global Lock, any thread can release
*/
if ((obj_desc->mutex.owner_thread->thread_id !=
if ((obj_desc->mutex.owner_thread_id !=
walk_state->thread->thread_id)
&& (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
ACPI_ERROR((AE_INFO,
"Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
(unsigned long)walk_state->thread->thread_id,
acpi_ut_get_node_name(obj_desc->mutex.node),
(unsigned long)obj_desc->mutex.owner_thread->thread_id));
(unsigned long)obj_desc->mutex.owner_thread_id));
return_ACPI_STATUS(AE_AML_NOT_OWNER);
}
@ -300,7 +296,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
/* Unlink the mutex from the owner's list */
acpi_ex_unlink_mutex(obj_desc);
acpi_ex_unlink_mutex(obj_desc, walk_state->thread);
/* Release the mutex, special case for Global Lock */
@ -312,7 +308,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
/* Update the mutex and restore sync_level */
obj_desc->mutex.owner_thread = NULL;
obj_desc->mutex.owner_thread_id = ACPI_MUTEX_NOT_ACQUIRED;
walk_state->thread->current_sync_level =
obj_desc->mutex.original_sync_level;
@ -367,7 +363,7 @@ void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
/* Mark mutex unowned */
obj_desc->mutex.owner_thread = NULL;
obj_desc->mutex.owner_thread_id = ACPI_MUTEX_NOT_ACQUIRED;
/* Update Thread sync_level (Last mutex is the important one) */