netdev - Re: [PATCH] bonding: get netdev_rx_handler

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Date:	Tue, 02 Apr 2013 08:26:02 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Veaceslav Falico <vfalico@...hat.com>
Cc:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net,
	edumazet@...gle.com
Subject: Re: [PATCH] bonding: get netdev_rx_handler_unregister out of locks

On Tue, 2013-04-02 at 17:15 +0200, Veaceslav Falico wrote:
> Now that netdev_rx_handler_unregister contains synchronize_net(), we need
> to call it outside of bond->lock, cause it might sleep. Also, remove the
> already unneded synchronize_net().
> 
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
> ---
>  drivers/net/bonding/bond_main.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 11a8cb3..78c9e2d 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1975,12 +1975,11 @@ static int __bond_release_one(struct net_device *bond_dev,
>  		return -EINVAL;
>  	}
>  
> +	write_unlock_bh(&bond->lock);
>  	/* unregister rx_handler early so bond_handle_frame wouldn't be called
>  	 * for this slave anymore.
>  	 */
>  	netdev_rx_handler_unregister(slave_dev);
> -	write_unlock_bh(&bond->lock);
> -	synchronize_net();
>  	write_lock_bh(&bond->lock);
>  
>  	if (!all && !bond->params.fail_over_mac) {

Good catch, thanks !

Acked-by: Eric Dumazet <edumazet@...gle.com>

I'll send a net-next patch to remove the synchronize_net() from bridge
code as well.



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