USB: cp210x: use generic submit_read_urb at open

There is no need to initialise the read urb as this is done at port
probe.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/cp210x.c

@@ -372,7 +372,6 @@ static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 
 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
-	struct usb_serial *serial = port->serial;
 	int result;
 
 	dbg("%s - port %d", __func__, port->number);
@@ -383,20 +382,9 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 		return -EPROTO;
 	}
 
-	/* Start reading from the device */
-	usb_fill_bulk_urb(port->read_urb, serial->dev,
-			usb_rcvbulkpipe(serial->dev,
-			port->bulk_in_endpointAddress),
-			port->read_urb->transfer_buffer,
-			port->read_urb->transfer_buffer_length,
-			serial->type->read_bulk_callback,
-			port);
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
-	if (result) {
-		dev_err(&port->dev, "%s - failed resubmitting read urb, "
-				"error %d\n", __func__, result);
+	result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);
+	if (result)
 		return result;
-	}
 
 	/* Configure the termios structure */
 	cp210x_get_termios(tty, port);