diff options
Diffstat (limited to 'kernel/drivers/usb/serial/mct_u232.c')
| -rw-r--r-- | kernel/drivers/usb/serial/mct_u232.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/drivers/usb/serial/mct_u232.c b/kernel/drivers/usb/serial/mct_u232.c index fd707d6a1..89726f702 100644 --- a/kernel/drivers/usb/serial/mct_u232.c +++ b/kernel/drivers/usb/serial/mct_u232.c @@ -376,14 +376,21 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port, static int mct_u232_port_probe(struct usb_serial_port *port) { + struct usb_serial *serial = port->serial; struct mct_u232_private *priv; + /* check first to simplify error handling */ + if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) { + dev_err(&port->dev, "expected endpoint missing\n"); + return -ENODEV; + } + priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; /* Use second interrupt-in endpoint for reading. */ - priv->read_urb = port->serial->port[1]->interrupt_in_urb; + priv->read_urb = serial->port[1]->interrupt_in_urb; priv->read_urb->context = port; spin_lock_init(&priv->lock); |