pnpbios: bail out on strange errors

A small number of systems respond to PnP dock queries with bogus values.
This causes us to keep logging an error every 2 seconds. Instead of trying
again just assume the BIOS is crapware and doesn't actually have dock
functionality.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/pnp/pnpbios/core.c

@@ -181,7 +181,8 @@ static int pnp_dock_thread(void *unused)
 			break;
 		default:
 			pnpbios_print_status("pnp_dock_thread", status);
-			continue;
+			printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n");
+			complete_and_exit(&unload_sem, 0);
 		}
 		if (d != docked) {
 			if (pnp_dock_event(d, &now) == 0) {