[080/152] ACPICA: Fix Scope() op in module level code

Greg KH
2011-01-06T00:47:00Z

From: Bob Moore <robert.moore@intel.com>

commit 8df3fc981dc12d9fdcaef4100a2193b605024d7a upstream.

Some Panasonic Toughbooks create nodes in module level code.
Module level code is the executable AML code outside of control method,
for example, below AML code creates a node \_SB.PCI0.GFX0.DD02.CUBL

If (\_OSI ("Windows 2006"))
{
Scope (\_SB.PCI0.GFX0.DD02)
{
Name (CUBL, Ones)
...
}
}

Scope() op does not actually create a new object, it refers to an
existing object(\_SB.PCI0.GFX0.DD02 in above example). However, for
Scope(), we want to indeed open a new scope, so the child nodes(CUBL in
above example) can be created correctly under it.

https://bugzilla.kernel.org/show_bug.cgi?id=19462

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/acpi/acpica/dswexec.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

--- a/drivers/acpi/acpica/dswexec.c
+++ b/drivers/acpi/acpica/dswexec.c
@@ -300,10 +300,25 @@ acpi_ds_exec_begin_op(struct acpi_walk_s
* we must enter this object into the namespace. The created
* object is temporary and will be deleted upon completion of
* the execution of this method.
+ *
+ * Note 10/2010: Except for the Scope() op. This opcode does
+ * not actually create a new object, it refers to an existing
+ * object. However, for Scope(), we want to indeed open a
+ * new scope.
*/
- status = acpi_ds_load2_begin_op(walk_state, NULL);
+ if (op->common.aml_opcode != AML_SCOPE_OP) {
+ status =
+ acpi_ds_load2_begin_op(walk_state, NULL);
+ } else {
+ status =
+ acpi_ds_scope_stack_push(op->named.node,
+ op->named.node->
+ type, walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
}
-
break;