ACPICA: Fix to allow zero-length ASL field declarations

Allows null field list in Field(), BankField(), and IndexField().

2.6.26-rc1 regression: ACPI fails to load SDT. - Dell M1530
http://bugzilla.kernel.org/show_bug.cgi?id=10606

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>

diff --git a/drivers/acpi/dispatcher/dsfield.c b/drivers/acpi/dispatcher/dsfield.c
index c780783..f988a5e 100644 (file)
--- a/drivers/acpi/dispatcher/dsfield.c
+++ b/drivers/acpi/dispatcher/dsfield.c
@@ -450,10 +450,6 @@ acpi_ds_init_field_objects(union acpi_parse_object *op,
                return_ACPI_STATUS(AE_BAD_PARAMETER);
        }
 
-       if (!arg) {
-               return_ACPI_STATUS(AE_AML_NO_OPERAND);
-       }
-
        /* Creating new namespace node(s), should not already exist */
 
        flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
@@ -467,6 +463,7 @@ acpi_ds_init_field_objects(union acpi_parse_object *op,
 
        /*
         * Walk the list of entries in the field_list
+        * Note: field_list can be of zero length. In this case, Arg will be NULL.
         */
        while (arg) {
                /*