netdev - Re: [v2 PATCH 0/2] rhashtable: rhashtable with duplicate objects

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Date:   Mon, 19 Sep 2016 12:04:52 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, Thomas Graf <tgraf@...g.ch>,
        tom@...bertland.com, Ben Greear <greearb@...delatech.com>
Subject: Re: [v2 PATCH 0/2] rhashtable: rhashtable with duplicate objects

On Mon, 2016-09-19 at 12:02 +0200, Johannes Berg wrote:
> On Mon, 2016-09-19 at 11:54 +0200, Johannes Berg wrote:
> > 
> > > 
> > > 
> > > The stack trace is useless, but my other annotation showed that
> > > the
> > > table's nelems *underflowed* to -1, so now the worker will
> > > continue
> > > to try to grow it forever.
> > > 
> > 
> > And this *was* actually a case of duplication, afaict, since it was
> > multiple virtual interfaces on the same device all connecting to
> > the
> > same AP.
> 
> It seems that __rhashtable_remove_fast_one() should return 0 even in
> the case of err==1 for the "skip all the maintenance due to list
> deletion"?
> 
> --- a/include/linux/rhashtable.h
> +++ b/include/linux/rhashtable.h
> @@ -1009,7 +1009,7 @@ static inline int __rhashtable_remove_fast_one(
>                 err = 0;
>         }
>  
> -       return err;
> +       return err < 0 ? err : 0;
>  }
> 

No, that's obviously bogus and already handled - wrong case anyway.
Sorry.

johannes