linux-kernel - Re: [B.A.T.M.A.N.] [PATCH 40/50] batman-adv: use dev_hw_addr_random() instead of random_ether

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Message-ID: <4131504.bFpDbrJZp3@sven-laptop.home.narfation.org>
Date:	Thu, 09 Feb 2012 09:44:12 +0100
From:	Sven Eckelmann <sven@...fation.org>
To:	b.a.t.m.a.n@...ts.open-mesh.org
Cc:	Danny Kukawka <danny.kukawka@...ect.de>,
	Marek Lindner <lindner_marek@...oo.de>, netdev@...r.kernel.org,
	Danny Kukawka <dkukawka@...e.de>, linux-kernel@...r.kernel.org,
	Simon Wunderlich <siwu@....tu-chemnitz.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [B.A.T.M.A.N.] [PATCH 40/50] batman-adv: use dev_hw_addr_random() instead of random_ether_addr()

On Wednesday 08 February 2012 22:10:47 Danny Kukawka wrote:
> Use dev_hw_addr_random() instead of calling random_ether_addr()
> to set addr_assign_type correctly to NET_ADDR_RANDOM.
> 
> Reset the state to NET_ADDR_PERM as soon as the MAC get
> changed via .ndo_set_mac_address.
> 
> Signed-off-by: Danny Kukawka <danny.kukawka@...ect.de>
> ---
>  net/batman-adv/soft-interface.c |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/net/batman-adv/soft-interface.c
> b/net/batman-adv/soft-interface.c index 987c75a..865a485 100644
> --- a/net/batman-adv/soft-interface.c
> +++ b/net/batman-adv/soft-interface.c
> @@ -541,6 +541,9 @@ static int interface_set_mac_addr(struct net_device
> *dev, void *p) }
> 
>  	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
> +	if (dev->addr_assign_type & NET_ADDR_RANDOM)
> +		dev->addr_assign_type ^= NET_ADDR_RANDOM;
> +
>  	return 0;
>  }

Why not something like

dev->addr_assign_type &= ~NET_ADDR_RANDOM;

? It is a relative common way inside the kernel to do this kind of stuff.

Thanks,
	Sven

PS: For the batman-adv people. This functionality was introduced with 2.6.36. 
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