static void arpc_in_callback()

in es2.c [1024:1071]

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

static void arpc_in_callback(struct urb *urb)
{
	struct es2_ap_dev *es2 = urb->context;
	struct device *dev = &urb->dev->dev;
	int status = check_urb_status(urb);
	struct arpc *rpc;
	struct arpc_response_message *resp;
	unsigned long flags;
	int retval;

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

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

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

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

	resp = urb->transfer_buffer;
	spin_lock_irqsave(&es2->arpc_lock, flags);
	rpc = arpc_find(es2, resp->id);
	if (!rpc) {
		dev_err(dev, "invalid arpc response id received: %u\n",
			le16_to_cpu(resp->id));
		spin_unlock_irqrestore(&es2->arpc_lock, flags);
		goto exit;
	}

	arpc_del(es2, rpc);
	memcpy(rpc->resp, resp, sizeof(*resp));
	complete(&rpc->response_received);
	spin_unlock_irqrestore(&es2->arpc_lock, flags);

exit:
	/* put our urb back in the request pool */
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
}