Re: [PATCH 19/29] batman-adv: fix random jitter calculation

Akinobu Mita
2012-12-25T21:43:22Z

2012/12/25 Antonio Quartulli <ordex@autistici.org>:
> On Mon, Dec 24, 2012 at 11:14:06AM +0900, Akinobu Mita wrote:
>> 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@gmail.com>
>> Cc: Marek Lindner <lindner_marek@yahoo.de>
>> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
>> Cc: Antonio Quartulli <ordex@autistici.org>
>> Cc: b.a.t.m.a.n@lists.open-mesh.org
>> Cc: "David S. Miller" <davem@davemloft.net>
>> Cc: netdev@vger.kernel.org
>> ---
>
> Acked-by: Antonio Quartulli <ordex@autistici.org>
>
> But I would suggest to apply this change to net, since it is a fix.

I agree.
David, please consider to apply this patch for 3.8-rc*.