> +void ncsi_ethtool_register_dev(struct net_device *dev)
> +{
> +     struct ethtool_ops *ops;
> +
> +     ops = (struct ethtool_ops *)(dev->ethtool_ops);

Why do you need the cast here?

Ah, is it because net_device has:

          const struct ethtool_ops *ethtool_ops;

i.e. you are casting off the const.

> +     if (!ops)
> +             return;
> +
> +     ops->get_ncsi_channels = ncsi_get_channels;

and here you modify it. Which is going to blow up, because it will be
in a read only segment and should throw an opps when you write to it?

You need to export ncsi_get_channels, and let the underlying driver
add it to its own ethtool_ops.

   Andrew

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