1 files changed, 7 insertions, 23 deletions

diff --git a/sys/contrib/dev/acpica/dsmthdat.c b/sys/contrib/dev/acpica/dsmthdat.c
index ed3d14e..3515957 100644
--- a/sys/contrib/dev/acpica/dsmthdat.c
+++ b/sys/contrib/dev/acpica/dsmthdat.c
@@ -392,7 +392,6 @@ AcpiDsMethodDataSetValue (
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
-    ACPI_OPERAND_OBJECT     *NewDesc = Object;
 
 
     ACPI_FUNCTION_TRACE ("DsMethodDataSetValue");
@@ -411,32 +410,17 @@ AcpiDsMethodDataSetValue (
         return_ACPI_STATUS (Status);
     }
 
-    /*
-     * If the object has just been created and is not attached to anything,
-     * (the reference count is 1), then we can just store it directly into
-     * the arg/local.  Otherwise, we must copy it.
+    /* 
+     * Increment ref count so object can't be deleted while installed.
+     * NOTE: We do not copy the object in order to preserve the call by
+     * reference semantics of ACPI Control Method invocation.
+     * (See ACPI Specification 2.0C)
      */
-    if (Object->Common.ReferenceCount > 1)
-    {
-        Status = AcpiUtCopyIobjectToIobject (Object, &NewDesc, WalkState);
-        if (ACPI_FAILURE (Status))
-        {
-            return_ACPI_STATUS (Status);
-        }
-
-       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Object Copied %p, new %p\n",
-           Object, NewDesc));
-    }
-    else
-    {
-        /* Increment ref count so object can't be deleted while installed */
-
-        AcpiUtAddReference (NewDesc);
-    }
+    AcpiUtAddReference (Object);
 
     /* Install the object */
 
-    Node->Object = NewDesc;
+    Node->Object = Object;
     return_ACPI_STATUS (Status);
 }