netdev - Re: [PATCH net v2] net: bareudp: add missing error handling for bareudp_link

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Date:   Tue, 5 Jan 2021 15:36:27 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        martin.varghese@...ia.com, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net v2] net: bareudp: add missing error handling for bareudp_link_config()

On Tue, Jan 5, 2021 at 2:39 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 5 Jan 2021 12:38:54 -0800 Cong Wang wrote:
> > On Tue, Jan 5, 2021 at 11:07 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > > +static void bareudp_dellink(struct net_device *dev, struct list_head *head)
> > > +{
> > > +       struct bareudp_dev *bareudp = netdev_priv(dev);
> > > +
> > > +       list_del(&bareudp->next);
> > > +       unregister_netdevice_queue(dev, head);
> > > +}
> > > +
> > >  static int bareudp_newlink(struct net *net, struct net_device *dev,
> > >                            struct nlattr *tb[], struct nlattr *data[],
> > >                            struct netlink_ext_ack *extack)
> > >  {
> > >         struct bareudp_conf conf;
> > > +       LIST_HEAD(list_kill);
> > >         int err;
> > >
> > >         err = bareudp2info(data, &conf, extack);
> > > @@ -662,17 +671,14 @@ static int bareudp_newlink(struct net *net, struct net_device *dev,
> > >
> > >         err = bareudp_link_config(dev, tb);
> > >         if (err)
> > > -               return err;
> > > +               goto err_unconfig;
> > >
> > >         return 0;
> > > -}
> > > -
> > > -static void bareudp_dellink(struct net_device *dev, struct list_head *head)
> > > -{
> > > -       struct bareudp_dev *bareudp = netdev_priv(dev);
> > >
> > > -       list_del(&bareudp->next);
> > > -       unregister_netdevice_queue(dev, head);
> > > +err_unconfig:
> > > +       bareudp_dellink(dev, &list_kill);
> > > +       unregister_netdevice_many(&list_kill);
> >
> > Why do we need unregister_netdevice_many() here? I think
> > bareudp_dellink(dev, NULL) is sufficient as we always have
> > one instance to unregister?
> >
> > (For the same reason, bareudp_dev_create() does not need it
> > either.)
>
> Ack, I'm following how bareudp_dev_create() is written.
>
> I can follow up in net-next and change both, sounds good?

Yes, either way is fine.

Thanks.