netdev - Re: [PATCH 17/17] batman-adv: Avoid precedence issues in macros

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Date:   Fri, 28 Oct 2016 23:27:31 +0200
From:   Sven Eckelmann <sven@...fation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Simon Wunderlich <sw@...onwunderlich.de>, davem@...emloft.net,
        netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        Antonio Quartulli <a@...table.cc>
Subject: Re: [PATCH 17/17] batman-adv: Avoid precedence issues in macros

On Freitag, 28. Oktober 2016 14:13:06 CEST Joe Perches wrote:
> On Thu, 2016-10-27 at 21:01 +0200, Simon Wunderlich wrote:
> > From: Sven Eckelmann <sven@...fation.org>
> > 
> > It must be avoided that arguments to a macro are evaluated ungrouped (which
> > enforces normal operator precendence). Otherwise the result of the macro
> > is not well defined.
> 
> Curiosity:
> 
> in net/batman-adv/tp_meter.c
[...]
> 	orig_node = batadv_orig_hash_find(bat_priv, tp_vars->other_end);
> 	if (unlikely(!orig_node)) {
> 		err = BATADV_TP_REASON_DST_UNREACHABLE;
> 		tp_vars->reason = err;
> 		goto out;
> 	}
> 
> 	primary_if = batadv_primary_if_get_selected(bat_priv);
> 	if (unlikely(!primary_if)) {
> 		err = BATADV_TP_REASON_DST_UNREACHABLE;
> 		goto out;
> 	}
> 
> err is not used in the out block
> 
> Is the last if block supposed to set tp_vars->reason to err?

This seems to be unrelated to this patch.

But yes, looks to me like it is missing. Do you want to propose a patch or
should I do? Just make sure you Cc Antonio Quartulli <a@...table.cc> (and of
course b.a.t.m.a.n@...ts.open-mesh.org). He is the original author of
33a3bb4a3345 ("batman-adv: throughput meter implementation").

Kind regards,
	Sven
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