static int cm_chan_connect()

in rio_cm.c [1778:1827]

• 38 lines of code
• 8 McCabe index (conditional complexity)

static int cm_chan_connect(void __user *arg)
{
	struct rio_cm_channel chan;
	struct cm_dev *cm;
	struct cm_peer *peer;
	int ret = -ENODEV;

	if (copy_from_user(&chan, arg, sizeof(chan)))
		return -EFAULT;
	if (chan.mport_id >= RIO_MAX_MPORTS)
		return -EINVAL;

	down_read(&rdev_sem);

	/* Find matching cm_dev object */
	list_for_each_entry(cm, &cm_dev_list, list) {
		if (cm->mport->id == chan.mport_id) {
			ret = 0;
			break;
		}
	}

	if (ret)
		goto err_out;

	if (chan.remote_destid >= RIO_ANY_DESTID(cm->mport->sys_size)) {
		ret = -EINVAL;
		goto err_out;
	}

	/* Find corresponding RapidIO endpoint device object */
	ret = -ENODEV;

	list_for_each_entry(peer, &cm->peers, node) {
		if (peer->rdev->destid == chan.remote_destid) {
			ret = 0;
			break;
		}
	}

	if (ret)
		goto err_out;

	up_read(&rdev_sem);

	return riocm_ch_connect(chan.id, cm, peer, chan.remote_channel);
err_out:
	up_read(&rdev_sem);
	return ret;
}