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

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Message-ID: <20210104094936.79247c33@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 4 Jan 2021 09:49:36 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
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] net: bareudp: add missing error handling for
 bareudp_link_config()

On Sat, 2 Jan 2021 15:49:54 -0800 Cong Wang wrote:
> On Wed, Dec 30, 2020 at 7:46 PM Jakub Kicinski <kuba@...nel.org> wrote:
> > @@ -661,9 +662,14 @@ 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;
> > +
> > +err_unconfig:  
> 
> I think we can save this goto.

I personally prefer more idiomatic code flow to saving a single LoC.

> > +       list_del(&bareudp->next);
> > +       unregister_netdevice(dev);  
> 
> Which is bareudp_dellink(dev, NULL). ;)

I know, but calling full dellink when only parts of newlink fails felt
weird. And it's not lower LoC, unless called with NULL as second arg,
which again could be surprising to a person changing dellink. 


But I can change both if you feel strongly.