diff options
| author | Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com> | 2007-02-15 16:12:23 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-02-15 16:13:16 -0500 |
| commit | c0d127b56937c3e72c2b1819161d2f6718eee877 (patch) | |
| tree | 40ac0fd3a628685ce25d11d1b00360344279ec5b /include/acpi | |
| parent | 724339d76d9407cd1a8ad32a9c1fdf64840cc51b (diff) | |
| download | linux-c0d127b56937c3e72c2b1819161d2f6718eee877.tar.bz2 | |
ACPICA: fix AML mutex re-entrancy
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>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/acinterp.h | 3 | ||||
| -rw-r--r-- | include/acpi/acobject.h | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/include/acpi/acinterp.h b/include/acpi/acinterp.h index ce7c9d653910..73967c8152d3 100644 --- a/include/acpi/acinterp.h +++ b/include/acpi/acinterp.h @@ -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 diff --git a/include/acpi/acobject.h b/include/acpi/acobject.h index 04e9735a6742..5206d61d74a6 100644 --- a/include/acpi/acobject.h +++ b/include/acpi/acobject.h @@ -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 */ |