static int cm_ep_get_list()

in rio_cm.c [1560:1611]

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

static int cm_ep_get_list(void __user *arg)
{
	struct cm_dev *cm;
	struct cm_peer *peer;
	u32 info[2];
	void *buf;
	u32 nent;
	u32 *entry_ptr;
	u32 i = 0;
	int ret = 0;

	if (copy_from_user(&info, arg, sizeof(info)))
		return -EFAULT;

	if (info[1] >= RIO_MAX_MPORTS || info[0] > RIOCM_MAX_EP_COUNT)
		return -EINVAL;

	/* Find a matching cm_dev object */
	down_read(&rdev_sem);
	list_for_each_entry(cm, &cm_dev_list, list)
		if (cm->mport->id == (u8)info[1])
			goto found;

	up_read(&rdev_sem);
	return -ENODEV;

found:
	nent = min(info[0], cm->npeers);
	buf = kcalloc(nent + 2, sizeof(u32), GFP_KERNEL);
	if (!buf) {
		up_read(&rdev_sem);
		return -ENOMEM;
	}

	entry_ptr = (u32 *)((uintptr_t)buf + 2*sizeof(u32));

	list_for_each_entry(peer, &cm->peers, node) {
		*entry_ptr = (u32)peer->rdev->destid;
		entry_ptr++;
		if (++i == nent)
			break;
	}
	up_read(&rdev_sem);

	((u32 *)buf)[0] = i; /* report an updated number of entries */
	((u32 *)buf)[1] = info[1]; /* put back an mport ID */
	if (copy_to_user(arg, buf, sizeof(u32) * (info[0] + 2)))
		ret = -EFAULT;

	kfree(buf);
	return ret;
}