From 5d4121c04b3577e37e389b3553d442f44bb346d7 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Fri, 17 Aug 2012 14:27:52 +0200 Subject: [PATCH] TTY: check if tty->port is assigned And if not, complain loudly. None in-kernel module should trigger that, but let us find out for sure. On the other hand, all the out-of-tree modules will hit that. Give them some time (maybe one release) to catch up. Signed-off-by: Jiri Slaby Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 28c3e869ebba..41e42f13a214 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1415,6 +1415,10 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx) if (!tty->port) tty->port = driver->ports[idx]; + WARN_RATELIMIT(!tty->port, + "%s: %s driver does not set tty->port. This will crash the kernel later. Fix the driver!\n", + __func__, tty->driver->name); + /* * Structures all installed ... call the ldisc open routines. * If we fail here just call release_tty to clean up. No need