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Diffstat (limited to 'kernel/drivers/usb/serial/mct_u232.c')
-rw-r--r--kernel/drivers/usb/serial/mct_u232.c9
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);