ACPICA: Reduce error to warning for incorrect method arg count

Previously aborted with error if too few arguments were passed to
a control method via the external ACPICA interface. Now issue a
warning instead and continue. Handles the case where the method
inadvertently declares too many arguments, but does not actually
use the extra ones.  Applies mainly to the predefined methods.

http://bugzilla.kernel.org/show_bug.cgi?id=11032

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
index 0a1ae67..42dae12 100644 (file)
--- a/drivers/acpi/namespace/nseval.c
+++ b/drivers/acpi/namespace/nseval.c
@@ -148,21 +148,22 @@ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info * info)
                                info->param_count++;
                }
 
-               /* Error if too few arguments were passed in */
+               /*
+                * Warning if too few or too many arguments have been passed by the
+                * caller. We don't want to abort here with an error because an
+                * incorrect number of arguments may not cause the method to fail.
+                * However, the method will fail if there are too few arguments passed
+                * and the method attempts to use one of the missing ones.
+                */
 
                if (info->param_count < info->obj_desc->method.param_count) {
-                       ACPI_ERROR((AE_INFO,
+                       ACPI_WARNING((AE_INFO,
                                    "Insufficient arguments - "
                                    "method [%4.4s] needs %d, found %d",
                                    acpi_ut_get_node_name(info->resolved_node),
                                    info->obj_desc->method.param_count,
                                    info->param_count));
-                       return_ACPI_STATUS(AE_MISSING_ARGUMENTS);
-               }
-
-               /* Just a warning if too many arguments */
-
-               else if (info->param_count >
+               } else if (info->param_count >
                                info->obj_desc->method.param_count) {
                        ACPI_WARNING((AE_INFO,
                                      "Excess arguments - "