diff -r -c old/drivers/acpi/bus.c new/drivers/acpi/bus.c
*** old/drivers/acpi/bus.c	Fri May 16 09:55:19 2003
--- new/drivers/acpi/bus.c	Fri May 16 09:58:01 2003
***************
*** 1249,1254 ****
--- 1249,1257 ----
  	if (!driver)
  		return_VALUE(-EINVAL);
  
+ 	if (acpi_disabled)
+ 		return_VALUE(-ENODEV);
+ 
  	down(&acpi_bus_drivers_lock);
  	list_add_tail(&driver->node, &acpi_bus_drivers);
  	up(&acpi_bus_drivers_lock);