ACPI: extend "acpi_osi=" boot option

The boot option "acpi_osi=" has always disabled Linux _OSI support,
thus disabling all OS Interface strings which are advertised
by Linux to the BIOS.

Now...
acpi_osi="string" adds the interface string, and
acpi_osi="!string" invalidates the pre-defined interface string

eg. acpi_osi="!Windows 2006"
would disable Linux's claim of Vista compatibility.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 26 insertions, 1 deletions

diff --git a/drivers/acpi/utilities/uteval.c b/drivers/acpi/utilities/uteval.c
index 13d5879cd98b..a10120ad6982 100644
--- a/drivers/acpi/utilities/uteval.c
+++ b/drivers/acpi/utilities/uteval.c
@@ -59,7 +59,7 @@ acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
 /*
  * Strings supported by the _OSI predefined (internal) method.
  */
-static const char *acpi_interfaces_supported[] = {
+static char *acpi_interfaces_supported[] = {
         /* Operating System Vendor Strings */
 
         "Linux",
@@ -158,6 +158,31 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_osi_invalidate
+ *
+ * PARAMETERS:  interface_string
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: invalidate string in pre-defiend _OSI string list
+ *
+ ******************************************************************************/
+
+acpi_status acpi_osi_invalidate(char *interface)
+{
+        int i;
+
+        for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
+                if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i])) {
+                        *acpi_interfaces_supported[i] = '\0';
+                        return AE_OK;
+                }
+        }
+        return AE_NOT_FOUND;
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ut_evaluate_object
  *
  * PARAMETERS:  prefix_node         - Starting node