ACPICA: Ignore ACPI table signature for Load() operator

Only "SSDT" is acceptable to the ACPI spec, but tables are
seen with OEMx and null sigs. Therefore, signature validation
is worthless.  Apparently MS ACPI accepts such signatures, ACPICA
must be compatible.

http://bugzilla.kernel.org/show_bug.cgi?id=10454

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/tables/tbinstal.c b/drivers/acpi/tables/tbinstal.c
index 402f93e1ff2079eb5f49dde56d690513560b1c81..5336ce88f89f74b47790be39ceadabd8a5b345b3 100644 (file)
--- a/drivers/acpi/tables/tbinstal.c
+++ b/drivers/acpi/tables/tbinstal.c
@@ -123,24 +123,13 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc,
                }
        }
 
-       /* The table must be either an SSDT or a PSDT or an OEMx */
-
-       if (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_PSDT)&&
-           !ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT)&&
-           strncmp(table_desc->pointer->signature, "OEM", 3)) {
-               /* Check for a printable name */
-               if (acpi_ut_valid_acpi_name(
-                       *(u32 *) table_desc->pointer->signature)) {
-                       ACPI_ERROR((AE_INFO, "Table has invalid signature "
-                                       "[%4.4s], must be SSDT or PSDT",
-                                   table_desc->pointer->signature));
-               } else {
-                       ACPI_ERROR((AE_INFO, "Table has invalid signature "
-                                       "(0x%8.8X), must be SSDT or PSDT",
-                                   *(u32 *) table_desc->pointer->signature));
-               }
-               return_ACPI_STATUS(AE_BAD_SIGNATURE);
-       }
+       /*
+        * Originally, we checked the table signature for "SSDT" or "PSDT" here.
+        * Next, we added support for OEMx tables, signature "OEM".
+        * Valid tables were encountered with a null signature, so we've just
+        * given up on validating the signature, since it seems to be a waste
+        * of code. The original code was removed (05/2008).
+        */
 
        (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);