2.6.24

 Documentation

diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index 048a876..8e65c44 100644
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -132,6 +132,14 @@ set_termios()      Notify the tty driver that the device's termios
          tty->termios. Previous settings should be passed in
          the "old" argument.
 
+         The API is defined such that the driver should return
+         the actual modes selected. This means that the
+         driver function is responsible for modifying any
+         bits in the request it cannot fulfill to indicate
+         the actual modes being used. A device with no
+         hardware capability for change (eg a USB dongle or
+         virtual port) can provide NULL for this method.
+
 throttle()      Notify the tty driver that input buffers for the
          line discipline are close to full, and it should
          somehow signal that no more characters should be