int of_overlay_remove()

in overlay.c [1192:1257]

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

int of_overlay_remove(int *ovcs_id)
{
	struct overlay_changeset *ovcs;
	int ret, ret_apply, ret_tmp;

	if (devicetree_corrupt()) {
		pr_err("suspect devicetree state, refuse to remove overlay\n");
		ret = -EBUSY;
		goto out;
	}

	mutex_lock(&of_mutex);

	ovcs = idr_find(&ovcs_idr, *ovcs_id);
	if (!ovcs) {
		ret = -ENODEV;
		pr_err("remove: Could not find overlay #%d\n", *ovcs_id);
		goto out_unlock;
	}

	if (!overlay_removal_is_ok(ovcs)) {
		ret = -EBUSY;
		goto out_unlock;
	}

	ret = overlay_notify(ovcs, OF_OVERLAY_PRE_REMOVE);
	if (ret) {
		pr_err("overlay changeset pre-remove notify error %d\n", ret);
		goto out_unlock;
	}

	list_del(&ovcs->ovcs_list);

	ret_apply = 0;
	ret = __of_changeset_revert_entries(&ovcs->cset, &ret_apply);
	if (ret) {
		if (ret_apply)
			devicetree_state_flags |= DTSF_REVERT_FAIL;
		goto out_unlock;
	}

	ret = __of_changeset_revert_notify(&ovcs->cset);
	if (ret)
		pr_err("overlay remove changeset entry notify error %d\n", ret);
	/* notify failure is not fatal, continue */

	*ovcs_id = 0;

	ret_tmp = overlay_notify(ovcs, OF_OVERLAY_POST_REMOVE);
	if (ret_tmp) {
		pr_err("overlay changeset post-remove notify error %d\n",
		       ret_tmp);
		if (!ret)
			ret = ret_tmp;
	}

	free_overlay_changeset(ovcs);

out_unlock:
	mutex_unlock(&of_mutex);

out:
	pr_debug("%s() err=%d\n", __func__, ret);

	return ret;
}