ACPICA: Report error if method creates 2 objects with the same name

Fixed a regression where an error was no
longer emitted if a control method attempts to create 2
objects of the same name. This previously and now returns
AE_ALREADY_EXISTS. When this exception occurs, it invokes
the mechanism that will dynamically serialize the control
method to possible prevent future errors. (BZ 440)

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/acpi/parser/psparse.c b/drivers/acpi/parser/psparse.c
index a02aa62fe1e5..6e875cea17a9 100644
--- a/drivers/acpi/parser/psparse.c
+++ b/drivers/acpi/parser/psparse.c
@@ -540,6 +540,11 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 
                         if ((status == AE_ALREADY_EXISTS) &&
                             (!walk_state->method_desc->method.mutex)) {
+                                ACPI_INFO((AE_INFO,
+                                           "Marking method %4.4s as Serialized",
+                                           walk_state->method_node->name.
+                                           ascii));
+
                                 /*
                                  * Method tried to create an object twice. The probable cause is
                                  * that the method cannot handle reentrancy.