netdev - Re: [net-next v4 3/6] net: marvell: prestera: Add basic devlink support

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Date:   Tue, 28 Jul 2020 15:30:06 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mickey Rachamim <mickeyr@...vell.com>
Subject: Re: [net-next v4 3/6] net: marvell: prestera: Add basic devlink
 support

Hi Andy,

On Mon, Jul 27, 2020 at 04:07:07PM +0300, Andy Shevchenko wrote:
> On Mon, Jul 27, 2020 at 3:23 PM Vadym Kochan <vadym.kochan@...ision.eu> wrote:
> >
> > Add very basic support for devlink interface:
> >
> >     - driver name
> >     - fw version
> >     - devlink ports
> 
> ...
> 
> > +static int prestera_dl_info_get(struct devlink *dl,
> > +                               struct devlink_info_req *req,
> > +                               struct netlink_ext_ack *extack)
> > +{
> > +       struct prestera_switch *sw = devlink_priv(dl);
> > +       char buf[16];
> 
> > +       int err = 0;
> 
> Redundant assignment. When you got a comment the rule of thumb is to
> check your entire contribution and address where it's applicable.
> 
> > +       err = devlink_info_driver_name_put(req, PRESTERA_DRV_NAME);
> > +       if (err)
> > +               return err;
> > +
> > +       snprintf(buf, sizeof(buf), "%d.%d.%d",
> > +                sw->dev->fw_rev.maj,
> > +                sw->dev->fw_rev.min,
> > +                sw->dev->fw_rev.sub);
> > +
> 
> > +       err = devlink_info_version_running_put(req,
> > +                                              DEVLINK_INFO_VERSION_GENERIC_FW,
> > +                                              buf);
> > +       if (err)
> > +               return err;
> > +
> > +       return 0;
> 
> return devlink_...
> 
> > +}
> 
> ...
> 
> > +       err = devlink_register(dl, sw->dev->dev);
> > +       if (err) {
> > +               dev_warn(sw->dev->dev, "devlink_register failed: %d\n", err);
> > +               return err;
> > +       }
> > +
> > +       return 0;
> 
>   if (err)
>     dev_warn(...);
> 
>   return err;
Would not it better to have 'return 0' at the end to visually indicate
the success point ?

> 
> -- 
> With Best Regards,
> Andy Shevchenko

Thanks!