static int gnss_usb_probe()

in usb.c [118:190]

• 59 lines of code
• 7 McCabe index (conditional complexity)

static int gnss_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *in, *out;
	struct gnss_device *gdev;
	struct gnss_usb *gusb;
	struct urb *urb;
	size_t buf_len;
	void *buf;
	int ret;

	ret = usb_find_common_endpoints(intf->cur_altsetting, &in, &out, NULL,
			NULL);
	if (ret)
		return ret;

	gusb = kzalloc(sizeof(*gusb), GFP_KERNEL);
	if (!gusb)
		return -ENOMEM;

	gdev = gnss_allocate_device(&intf->dev);
	if (!gdev) {
		ret = -ENOMEM;
		goto err_free_gusb;
	}

	gdev->ops = &gnss_usb_gnss_ops;
	gdev->type = GNSS_TYPE_NMEA;
	gnss_set_drvdata(gdev, gusb);

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		ret = -ENOMEM;
		goto err_put_gdev;
	}

	buf_len = max(usb_endpoint_maxp(in), GNSS_USB_READ_BUF_LEN);

	buf = kzalloc(buf_len, GFP_KERNEL);
	if (!buf) {
		ret = -ENOMEM;
		goto err_free_urb;
	}

	usb_fill_bulk_urb(urb, udev,
			usb_rcvbulkpipe(udev, usb_endpoint_num(in)),
			buf, buf_len, gnss_usb_rx_complete, gusb);

	gusb->intf = intf;
	gusb->udev = udev;
	gusb->gdev = gdev;
	gusb->read_urb = urb;
	gusb->write_pipe = usb_sndbulkpipe(udev, usb_endpoint_num(out));

	ret = gnss_register_device(gdev);
	if (ret)
		goto err_free_buf;

	usb_set_intfdata(intf, gusb);

	return 0;

err_free_buf:
	kfree(buf);
err_free_urb:
	usb_free_urb(urb);
err_put_gdev:
	gnss_put_device(gdev);
err_free_gusb:
	kfree(gusb);

	return ret;
}