Subject: Re: 6lowpan: lockless tx queue of routing netlink device

From: Alexander Aring <[email-masked]>
Date: Mon, 10 Feb 2014 18:33:18 +0100

Hi Eric,

On Sun, Feb 09, 2014 at 04:41:47AM -0800, Eric Dumazet wrote:
> 
> Please try the following fix, thanks for this report !
> 
> diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
> index 48b25c0af4d0..069af33013c4 100644
> --- a/net/ieee802154/6lowpan.c
> +++ b/net/ieee802154/6lowpan.c
> @@ -533,7 +533,27 @@ static struct header_ops lowpan_header_ops = {
>  	.create	= lowpan_header_create,
>  };
>  
> +static struct lock_class_key lowpan_tx_busylock;
> +static struct lock_class_key lowpan_netdev_xmit_lock_key;
> +
> +static void lowpan_set_lockdep_class_one(struct net_device *dev,
> +					 struct netdev_queue *txq,
> +					 void *_unused)
> +{
> +	lockdep_set_class(&txq->_xmit_lock,
> +			  &lowpan_netdev_xmit_lock_key);
> +}
> +
> +
> +static int lowpan_dev_init(struct net_device *dev)
> +{
> +	netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
> +	dev->qdisc_tx_busylock = &lowpan_tx_busylock;
> +	return 0;
> +}
> +
>  static const struct net_device_ops lowpan_netdev_ops = {
> +	.ndo_init		= lowpan_dev_init,
>  	.ndo_start_xmit		= lowpan_xmit,
>  	.ndo_set_mac_address	= lowpan_set_address,
>  };

thanks, this fixed the issue. What we should do as next?

Should I create a patch for this or do you want to make a patch?

- Alex

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