netdev - Re: [PATCH net-next 4/7] ixgbe: protect vxlan_get_rx_port in ixgbe_service_task with rtnl

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Message-ID: <1465593442.7945.68.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Fri, 10 Jun 2016 14:17:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, jesse@...nel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Shannon Nelson <shannon.nelson@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Mitch Williams <mitch.a.williams@...el.com>
Subject: Re: [PATCH net-next 4/7] ixgbe: protect vxlan_get_rx_port in
 ixgbe_service_task with rtnl_lock

On Mon, 2016-04-18 at 21:19 +0200, Hannes Frederic Sowa wrote:
> vxlan_get_rx_port requires rtnl_lock to be held.
> 
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Cc: Shannon Nelson <shannon.nelson@...el.com>
> Cc: Carolyn Wyborny <carolyn.wyborny@...el.com>
> Cc: Don Skidmore <donald.c.skidmore@...el.com>
> Cc: Bruce Allan <bruce.w.allan@...el.com>
> Cc: John Ronciak <john.ronciak@...el.com>
> Cc: Mitch Williams <mitch.a.williams@...el.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 2976df77bf14f5..b2f2cf40f06a87 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -7192,10 +7192,12 @@ static void ixgbe_service_task(struct work_struct *work)
>  		return;
>  	}
>  #ifdef CONFIG_IXGBE_VXLAN
> +	rtnl_lock();
>  	if (adapter->flags2 & IXGBE_FLAG2_VXLAN_REREG_NEEDED) {
>  		adapter->flags2 &= ~IXGBE_FLAG2_VXLAN_REREG_NEEDED;
>  		vxlan_get_rx_port(adapter->netdev);
>  	}
> +	rtnl_unlock();
>  #endif /* CONFIG_IXGBE_VXLAN */
>  	ixgbe_reset_subtask(adapter);
>  	ixgbe_phy_interrupt_subtask(adapter);

Although there might be a deadlock with a concurrent
cancel_work_sync(&adapter->service_task);  from ixgbe_remove()