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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 15:04:51 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-24 03:38:35 +0400
commitb0e95858238d95f32edf00ff4a0375165129d0c6 (patch)
treee07bfa8ce5ce73a360cdd0f5185bf8da9433d48d /drivers/tty/tty_ldisc.c
parente97733ca677878d0ecf08af17f4661eb83e268bc (diff)
downloadlinux-b0e95858238d95f32edf00ff4a0375165129d0c6.tar.xz
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>
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
-rw-r--r--drivers/tty/tty_ldisc.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 5819667f5bdb..75fa99978348 100644
--- 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);
/*