diff options
Diffstat (limited to 'drivers/net/ppp_async.c')
| -rw-r--r-- | drivers/net/ppp_async.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c index f023d5b67e6e..098bf441b376 100644 --- a/drivers/net/ppp_async.c +++ b/drivers/net/ppp_async.c @@ -158,6 +158,9 @@ ppp_asynctty_open(struct tty_struct *tty) struct asyncppp *ap; int err; + if (!tty->driver->write) + return -EOPNOTSUPP; + err = -ENOMEM; ap = kzalloc(sizeof(*ap), GFP_KERNEL); if (!ap) |