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diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 613c852..09c86d2 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1322,7 +1322,11 @@ static int tty_reopen(struct tty_struct *tty)
tty->driver = driver; /* N.B. why do this every time?? */
mutex_lock(&tty->ldisc_mutex);
- WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
+ if (!test_bit(TTY_LDISC, &tty->flags)) {
+ printk("%s: !test_bit(TTY_LDISC, &tty->flags) dev=%s ldisc=%s\n",
+ __func__, tty->name, tty->ldisc ? tty->ldisc->ops ? tty->ldisc->ops->name : NULL : NULL);
+ WARN_ON(1);
+ }
mutex_unlock(&tty->ldisc_mutex);
return 0;
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