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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 <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Alexey Starikovskiy 2007-02-15 16:12:23 -05:00 • committed by Len Brown
commit c0d127b569
6 changed files with 25 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

3
include/acpi/acinterp.h
View file

@ -253,7 +253,8 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread);
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);
/*
* exprep - ACPI AML execution - prep utilities

2
include/acpi/acobject.h
View file

@ -155,7 +155,7 @@ struct acpi_object_event {
struct acpi_object_mutex {
ACPI_OBJECT_COMMON_HEADER u8 sync_level; /* 0-15, specified in Mutex() call */
u16 acquisition_depth; /* Allow multiple Acquires, same thread */
struct acpi_thread_state *owner_thread; /* Current owner of the mutex */
acpi_thread_id owner_thread_id; /* Current owner of the mutex */
acpi_mutex os_mutex; /* Actual OS synchronization object */
union acpi_operand_object *prev; /* Link for list of acquired mutexes */
union acpi_operand_object *next; /* Link for list of acquired mutexes */