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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>
hifive-unleashed-5.1
Peter Hurley 2013-06-15 07:04:51 -04:00 committed by Greg Kroah-Hartman
parent e97733ca67
commit b0e9585823
1 changed files with 6 additions and 4 deletions
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10
drivers/tty/tty_ldisc.c
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@ -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);
/*