netdev - Re: [PATCH net-next-2.6] net: Fix rxq ref counting

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Message-ID: <1286484966.3745.92.camel@edumazet-laptop>
Date:	Thu, 07 Oct 2010 22:56:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] net: Fix rxq ref counting

Le jeudi 07 octobre 2010 à 13:09 -0700, Tom Herbert a écrit :
> The rx->count reference is used to track reference counts to the
> number of rx-queue kobjects created for the device.  This patch
> eliminates initialization of the counter in netif_alloc_rx_queues
> and instead increments the counter each time a kobject is created.
> This is now symmetric with the decrement that is done when an object is
> released.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>
> ---
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 7d14955..58b31d1 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5026,7 +5026,6 @@ static int netif_alloc_rx_queues(struct net_device *dev)
>  			return -ENOMEM;
>  		}
>  		dev->_rx = rx;
> -		atomic_set(&rx->count, count);
>  
>  		/*
>  		 * Set a pointer to first element in the array which holds the
> diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
> index fa81fd0..b143173 100644
> --- a/net/core/net-sysfs.c
> +++ b/net/core/net-sysfs.c
> @@ -726,6 +726,7 @@ static struct kobj_type rx_queue_ktype = {
>  static int rx_queue_add_kobject(struct net_device *net, int index)
>  {
>  	struct netdev_rx_queue *queue = net->_rx + index;
> +	struct netdev_rx_queue *first = queue->first;
>  	struct kobject *kobj = &queue->kobj;
>  	int error = 0;
>  
> @@ -738,6 +739,7 @@ static int rx_queue_add_kobject(struct net_device *net, int index)
>  	}
>  
>  	kobject_uevent(kobj, KOBJ_ADD);
> +	atomic_inc(&first->count);
>  
>  	return error;
>  }

Acked-by: Eric Dumazet <eric.dumazet@...il.com>


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