linux-kernel - Re: [PATCH] batman-adv: fix random jitter calculation

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Message-Id: <20121226.141350.999199516661256197.davem@davemloft.net>
Date:	Wed, 26 Dec 2012 14:13:50 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	akinobu.mita@...il.com
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	lindner_marek@...oo.de, siwu@....tu-chemnitz.de,
	ordex@...istici.org, b.a.t.m.a.n@...ts.open-mesh.org
Subject: Re: [PATCH] batman-adv: fix random jitter calculation

From: Akinobu Mita <akinobu.mita@...il.com>
Date: Wed, 26 Dec 2012 21:32:10 +0900

> batadv_iv_ogm_emit_send_time() attempts to calculates a random integer
> in the range of 'orig_interval +- BATADV_JITTER' by the below lines.
> 
>         msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
>         msecs += (random32() % 2 * BATADV_JITTER);
> 
> But it actually gets 'orig_interval' or 'orig_interval - BATADV_JITTER'
> because '%' and '*' have same precedence and associativity is
> left-to-right.
> 
> This adds the parentheses at the appropriate position so that it matches
> original intension.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> Acked-by: Antonio Quartulli <ordex@...istici.org>

Applied, thanks.
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