netdev - Re: [PATCH] [net] net/mlx5e: fix another -Wmaybe-uninitialized warning

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Date:   Thu, 12 Jan 2017 11:10:32 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Or Gerlitz <ogerlitz@...lanox.com>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        Hadar Hen Zion <hadarh@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [net] net/mlx5e: fix another -Wmaybe-uninitialized warning

On Thursday, January 12, 2017 10:30:24 AM CET Or Gerlitz wrote:
> On 1/11/2017 11:14 PM, Arnd Bergmann wrote:
> > @@ -666,14 +666,15 @@ static int mlx5e_route_lookup_ipv4(struct mlx5e_priv *priv,
> >       struct rtable *rt;
> >       struct neighbour *n = NULL;
> >       int ttl;
> > +     int ret;
> > +
> > +     if (!IS_ENABLED(CONFIG_INET))
> > +             return -EOPNOTSUPP;
> >   
> > -#if IS_ENABLED(CONFIG_INET)
> >       rt = ip_route_output_key(dev_net(mirred_dev), fl4);
> > -     if (IS_ERR(rt))
> > -             return PTR_ERR(rt);
> > -#else
> > -     return -EOPNOTSUPP;
> > -#endif
> > +     ret = PTR_ERR_OR_ZERO(rt);
> > +     if (ret)
> > +             return ret;
> 
> but this means that if we got NULL from ip_route_output_key, we will 
> return success (0) here which is wrong.

I don't think so: if 'rt' is NULL or a valid pointer, then 'ret' is zero
and we will not return here.

	Arnd