diff options
| -rw-r--r-- | drivers/net/caif/caif_serial.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c index 3502f607117f..c669ec37483b 100644 --- a/drivers/net/caif/caif_serial.c +++ b/drivers/net/caif/caif_serial.c @@ -312,6 +312,10 @@ static int ldisc_open(struct tty_struct *tty) char name[64]; int result; + /* No write no play */ + if (tty->ops->write == NULL) + return -EOPNOTSUPP; + sprintf(name, "cf%s", tty->name); dev = alloc_netdev(sizeof(*ser), name, caifdev_setup); ser = netdev_priv(dev); |