diff options
Diffstat (limited to 'drivers/net/ppp_synctty.c')
| -rw-r--r-- | drivers/net/ppp_synctty.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ppp_synctty.c b/drivers/net/ppp_synctty.c index 0d80fa546719..73729383e976 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->driver->write) + return -EOPNOTSUPP; + ap = kzalloc(sizeof(*ap), GFP_KERNEL); err = -ENOMEM; if (!ap) |