[RFC] batman-adv: Set special lockdep classes to avoid lockdep warning

  [text will be added after I am awake... maybe]

[Should be fix the problem found in bug 162... formerly known as 161. code
stolen from macvlan... this is just a reimplementation of a solution proposed
by Simon Wunderlich]

Reported-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 soft-interface.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
  

Hey Sven,

it works in my QEMU machines (and I could reproduce the bug report from 162).

Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
(provided you add some sane commit message. ;] )


Cheers,
	Simon


On Sun, Aug 19, 2012 at 09:29:53AM +0200, Sven Eckelmann wrote:
> [text will be added after I am awake... maybe]
> 
> [Should be fix the problem found in bug 162... formerly known as 161. code
> stolen from macvlan... this is just a reimplementation of a solution proposed
> by Simon Wunderlich]
> 
> Reported-by: Linus Lüssing <linus.luessing@web.de>
> Signed-off-by: Sven Eckelmann <sven@narfation.org>
> ---
>  soft-interface.c |   29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/soft-interface.c b/soft-interface.c
> index 1aee7db..588c6f6 100644
> --- a/soft-interface.c
> +++ b/soft-interface.c
> @@ -344,7 +344,36 @@ out:
>  	return;
>  }
>  
> +/*
> + * batman-adv network devices have devices nesting below it and are a special
> + * "super class" of normal network devices; split their locks off into a
> + * separate class since they always nest.
> + */
> +static struct lock_class_key batadv_netdev_xmit_lock_key;
> +static struct lock_class_key batadv_netdev_addr_lock_key;
> +
> +static void batadv_set_lockdep_class_one(struct net_device *dev,
> +					 struct netdev_queue *txq,
> +					 void *_unused)
> +{
> +	lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
> +}
> +
> +static void batadv_set_lockdep_class(struct net_device *dev)
> +{
> +	lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
> +	netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
> +}
> +
> +static int batadv_softif_init(struct net_device *dev)
> +{
> +	batadv_set_lockdep_class(dev);
> +
> +	return 0;
> +}
> +
>  static const struct net_device_ops batadv_netdev_ops = {
> +	.ndo_init = batadv_softif_init,
>  	.ndo_open = batadv_interface_open,
>  	.ndo_stop = batadv_interface_release,
>  	.ndo_get_stats = batadv_interface_stats,
> -- 
> 1.7.10.4
> 
>