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serdev: ttyport: fix tty locking in close 

Make sure to hold the tty lock as required when calling tty-driver
close() (e.g. to avoid racing with hangup()).

Note that the serport active flag is currently set under the lock at
controller open, but really isn't protected by it.

Fixes: cd6484e183 ("serdev: Introduce new bus for serial attached devices")
Signed-off-by: Johan Hovold <johan@kernel.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-11-03 15:30:56 +01:00 committed by Greg Kroah-Hartman
parent 8bcd4e6a8d
commit 90dbad8cd6
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serdev/serdev-ttyport.c
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@ -154,8 +154,10 @@ static void ttyport_close(struct serdev_controller *ctrl)
clear_bit(SERPORT_ACTIVE, &serport->flags);
tty_lock(tty);
if (tty->ops->close)
tty->ops->close(tty, NULL);
tty_unlock(tty);
tty_release_struct(tty, serport->tty_idx);
}