diff options
| -rw-r--r-- | drivers/char/pty.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/pty.c b/drivers/char/pty.c index 5acd29e6e04..3910ce112a9 100644 --- a/drivers/char/pty.c +++ b/drivers/char/pty.c @@ -104,7 +104,7 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf, struct tty_struct *to = tty->link; int c; - if (!to || tty->stopped) + if (!to || !to->ldisc || tty->stopped) return 0; c = to->receive_room; @@ -148,7 +148,7 @@ static int pty_chars_in_buffer(struct tty_struct *tty) int count; /* We should get the line discipline lock for "tty->link" */ - if (!to || !to->ldisc->ops->chars_in_buffer) + if (!to || !to->ldisc || !to->ldisc->ops->chars_in_buffer) return 0; /* The ldisc must report 0 if no characters available to be read */ @@ -183,7 +183,7 @@ static void pty_flush_buffer(struct tty_struct *tty) struct tty_struct *to = tty->link; unsigned long flags; - if (!to) + if (!to || !to->ldisc) return; if (to->ldisc->ops->flush_buffer) |