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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 <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-08-17 14:27:52 +02:00 committed by Greg Kroah-Hartman
parent 63d486964c
commit 5d4121c04b
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/tty_io.c
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@ -1415,6 +1415,10 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
if (!tty->port) if (!tty->port)
tty->port = driver->ports[idx]; 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. * Structures all installed ... call the ldisc open routines.
* If we fail here just call release_tty to clean up. No need * If we fail here just call release_tty to clean up. No need