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path: root/drivers/char/pty.c
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Diffstat (limited to 'drivers/char/pty.c')
-rw-r--r--drivers/char/pty.c6
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)