netdev - Re: [patch net-next 1/4] net: sched: make tc_action_ops->get

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Date:   Tue, 10 Oct 2017 10:44:53 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Saeed Mahameed <saeedm@...lanox.com>, matanb@...lanox.com,
        leonro@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next 1/4] net: sched: make tc_action_ops->get_dev
 return dev and avoid passing net

On Tue, Oct 10, 2017 at 12:30 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> -static int tcf_mirred_device(const struct tc_action *a, struct net *net,
> -                            struct net_device **mirred_dev)
> +static struct net_device *tcf_mirred_get_dev(const struct tc_action *a)
>  {
> -       int ifindex = tcf_mirred_ifindex(a);
> +       struct tcf_mirred *m = to_mirred(a);
>
> -       *mirred_dev = __dev_get_by_index(net, ifindex);
> -       if (!*mirred_dev)
> -               return -EINVAL;
> -       return 0;
> +       return __dev_get_by_index(m->net, m->tcfm_ifindex);

Hmm, why not just return m->tcfm_dev?