1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/ppp_synctty.c b/drivers/net/ppp_synctty.c
index 0d80fa546719..48ed5fdbfe18 100644
--- a/drivers/net/ppp_synctty.c
+++ b/drivers/net/ppp_synctty.c
@@ -207,6 +207,9 @@ ppp_sync_open(struct tty_struct *tty)
         struct syncppp *ap;
         int err;
 
+        if (tty->ops->write == NULL)
+                return -EOPNOTSUPP;
+
         ap = kzalloc(sizeof(*ap), GFP_KERNEL);
         err = -ENOMEM;
         if (!ap)
@@ -399,8 +402,8 @@ ppp_sync_receive(struct tty_struct *tty, const unsigned char *buf,
                 tasklet_schedule(&ap->tsk);
         sp_put(ap);
         if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
-            && tty->driver->unthrottle)
-                tty->driver->unthrottle(tty);
+            && tty->ops->unthrottle)
+                tty->ops->unthrottle(tty);
 }
 
 static void
@@ -653,7 +656,7 @@ ppp_sync_push(struct syncppp *ap)
                         tty_stuffed = 0;
                 if (!tty_stuffed && ap->tpkt) {
                         set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
-                        sent = tty->driver->write(tty, ap->tpkt->data, ap->tpkt->len);
+                        sent = tty->ops->write(tty, ap->tpkt->data, ap->tpkt->len);
                         if (sent < 0)
                                 goto flush;     /* error, e.g. loss of CD */
                         if (sent < ap->tpkt->len) {