netdev - Re: [PATCH net-next] net: bridge: propagate error code and extack from br_mc_disabled

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Date:   Wed, 14 Apr 2021 18:13:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Nikolay Aleksandrov <nikolay@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Roopa Prabhu <roopa@...dia.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next] net: bridge: propagate error code and extack
 from br_mc_disabled_update

On Wed, Apr 14, 2021 at 05:58:04PM +0300, Nikolay Aleksandrov wrote:
> > @@ -3607,7 +3619,7 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
> >  			br_multicast_leave_snoopers(br);
> >  	}
> >  
> > -	return 0;
> > +	return err;
> 
> Here won't you return EOPNOTSUPP even though everything above was successful ?
> I mean if br_mc_disabled_update() returns -EOPNOTSUPP it will just be returned
> and the caller would think there was an error.
> 
> Did you try running the bridge selftests with this patch ?
> 
> Thanks,
>  Nik

Thanks, this is a good point. I think I should just do this instead:
	if (err == -EOPNOTSUPP)
		err = 0;
	if (err)
		...

And I haven't run the bridge selftests. You are talking about:
tools/testing/selftests/net/forwarding/bridge_{igmp,mld}.sh
right?