tty: Clarify multiple-references comment in TIOCSETD ioctl

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 5819667..75fa999 100644 (file)
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -570,13 +570,15 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
                tty_ldisc_restore(tty, old_ldisc);
        }
 
-       /* At this point we hold a reference to the new ldisc and a
-          a reference to the old ldisc. If we ended up flipping back
-          to the existing ldisc we have two references to it */
-
        if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc)
                tty->ops->set_ldisc(tty);
 
+       /* At this point we hold a reference to the new ldisc and a
+          reference to the old ldisc, or we hold two references to
+          the old ldisc (if it was restored as part of error cleanup
+          above). In either case, releasing a single reference from
+          the old ldisc is correct. */
+
        tty_ldisc_put(old_ldisc);
 
        /*