linux-kernel - Re: [PATCH v2] bridge: Fix a deadlock when enabling multicast snooping

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Date:   Fri, 4 Dec 2020 22:30:22 +0000
From:   "Huang, Joseph" <Joseph.Huang@...min.com>
To:     Nikolay Aleksandrov <nikolay@...dia.com>,
        Roopa Prabhu <roopa@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] bridge: Fix a deadlock when enabling multicast
 snooping

> > +     if (join_snoopers)
> > +             br_multicast_join_snoopers(br);
> > +     else if (leave_snoopers)
> > +             br_multicast_leave_snoopers(br);
> 
> If I'm not missing anything this can be just 1 bool like "change_snoopers" or
> something which if set to true will check BROPT_MULTICAST_ENABLED and
> act accordingly, i.e.
> if (change_snoopers) {
>     if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
>          br_multicast_join_snoopers(br);
>     else
>          br_multicast_leave_snoopers(br); }
> 
> This is not really something critical, just an observation. Up to your
> preference if you decide to leave it with 2 bools. :-)
> 
> Cheers,
>  Nik

I wasn't sure how expensive the call to br_opt_get is, so I used a bool for each.

I just checked and it seems that br_opt_get is probably just as cheap as a bool,
so I'll change it according to what you suggested here.

Thanks for your comments!!

Thanks,
Joseph