netdev - Re: [net-2.6 PATCH v2] net: zero kobject in rx_queue

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Message-ID: <1289973119.2732.104.camel@edumazet-laptop>
Date:	Wed, 17 Nov 2010 06:51:59 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	davem@...emloft.net, therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [net-2.6 PATCH v2] net: zero kobject in rx_queue_release

Le mardi 16 novembre 2010 à 21:42 -0800, John Fastabend a écrit :
> netif_set_real_num_rx_queues() can decrement and increment
> the number of rx queues. For example ixgbe does this as
> features and offloads are toggled. Presumably this could
> also happen across down/up on most devices if the available
> resources changed (cpu offlined).
> 
> The kobject needs to be zero'd in this case so that the
> state is not preserved across kobject_put()/kobject_init_and_add().
> 
> This resolves the following error report.
> 
> ixgbe 0000:03:00.0: eth2: NIC Link is Up 10 Gbps, Flow Control: RX/TX
> kobject (ffff880324b83210): tried to init an initialized object, something is seriously wrong.
> Pid: 1972, comm: lldpad Not tainted 2.6.37-rc18021qaz+ #169
> Call Trace:
>  [<ffffffff8121c940>] kobject_init+0x3a/0x83
>  [<ffffffff8121cf77>] kobject_init_and_add+0x23/0x57
>  [<ffffffff8107b800>] ? mark_lock+0x21/0x267
>  [<ffffffff813c6d11>] net_rx_queue_update_kobjects+0x63/0xc6
>  [<ffffffff813b5e0e>] netif_set_real_num_rx_queues+0x5f/0x78
>  [<ffffffffa0261d49>] ixgbe_set_num_queues+0x1c6/0x1ca [ixgbe]
>  [<ffffffffa0262509>] ixgbe_init_interrupt_scheme+0x1e/0x79c [ixgbe]
>  [<ffffffffa0274596>] ixgbe_dcbnl_set_state+0x167/0x189 [ixgbe]
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> ---

I am not sure why you resent it, anyway, I ack it

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

Thanks


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