static int init_request()

in core-cdev.c [576:621]

• 37 lines of code
• 10 McCabe index (conditional complexity)

static int init_request(struct client *client,
			struct fw_cdev_send_request *request,
			int destination_id, int speed)
{
	struct outbound_transaction_event *e;
	int ret;

	if (request->tcode != TCODE_STREAM_DATA &&
	    (request->length > 4096 || request->length > 512 << speed))
		return -EIO;

	if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
	    request->length < 4)
		return -EINVAL;

	e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
	if (e == NULL)
		return -ENOMEM;

	e->client = client;
	e->response.length = request->length;
	e->response.closure = request->closure;

	if (request->data &&
	    copy_from_user(e->response.data,
			   u64_to_uptr(request->data), request->length)) {
		ret = -EFAULT;
		goto failed;
	}

	e->r.resource.release = release_transaction;
	ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
	if (ret < 0)
		goto failed;

	fw_send_request(client->device->card, &e->r.transaction,
			request->tcode, destination_id, request->generation,
			speed, request->offset, e->response.data,
			request->length, complete_transaction, e);
	return 0;

 failed:
	kfree(e);

	return ret;
}