strip: Fix termios assumption

Strip assumes that the tty drivers always have a set_termios method which
may not be true. Check this when binding to the tty so that we don't oops
later.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index 5dd23c9..883af89 100644 (file)
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -2611,7 +2611,7 @@ static int strip_open(struct tty_struct *tty)
         * We need a write method.
         */
 
-       if (tty->ops->write == NULL)
+       if (tty->ops->write == NULL || tty->ops->set_termios == NULL)
                return -EOPNOTSUPP;
 
        /*