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SubjectRe: [PATCH v2 net-next 1/4] net/ethtool: add netlink interface for the PLCA RS
On Mon, Dec 05, 2022 at 02:41:35AM +0100, Piergiorgio Beruto wrote:
> +int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
> +{
> + struct ethnl_req_info req_info = {};
> + struct nlattr **tb = info->attrs;
> + const struct ethtool_phy_ops *ops;
> + struct phy_plca_cfg plca_cfg;
> + struct net_device *dev;
> +
> + bool mod = false;
> + int ret;
> +
> + ret = ethnl_parse_header_dev_get(&req_info,
> + tb[ETHTOOL_A_PLCA_HEADER],
> + genl_info_net(info), info->extack,
> + true);
> + if (ret < 0)
> + return ret;
> +
> + dev = req_info.dev;
> +
> + // check that the PHY device is available and connected
> + if (!dev->phydev) {
> + ret = -EOPNOTSUPP;
> + goto out;
> + }

This check should really be done under the RTNL lock. phydevs can come
and go with SFP cages.

> +
> + rtnl_lock();

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