static void cport_in_callback()

in es2.c [813:854]

• 33 lines of code
• 9 McCabe index (conditional complexity)

static void cport_in_callback(struct urb *urb)
{
	struct gb_host_device *hd = urb->context;
	struct device *dev = &urb->dev->dev;
	struct gb_operation_msg_hdr *header;
	int status = check_urb_status(urb);
	int retval;
	u16 cport_id;

	if (status) {
		if ((status == -EAGAIN) || (status == -EPROTO))
			goto exit;

		/* The urb is being unlinked */
		if (status == -ENOENT || status == -ESHUTDOWN)
			return;

		dev_err(dev, "urb cport in error %d (dropped)\n", status);
		return;
	}

	if (urb->actual_length < sizeof(*header)) {
		dev_err(dev, "short message received\n");
		goto exit;
	}

	/* Extract the CPort id, which is packed in the message header */
	header = urb->transfer_buffer;
	cport_id = gb_message_cport_unpack(header);

	if (cport_id_valid(hd, cport_id)) {
		greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
				  urb->actual_length);
	} else {
		dev_err(dev, "invalid cport id %u received\n", cport_id);
	}
exit:
	/* put our urb back in the request pool */
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
}