netdev - Re: [PATCH net 1/1] driver: macvtap: Unregister netdev rx_handler if macvtap

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Date:   Fri, 25 Nov 2016 10:48:58 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     fgao@...vckh6395k16k5.yundunddos.com, davem@...emloft.net,
        edumazet@...gle.com, netdev@...r.kernel.org, gfree.wind@...il.com
Subject: Re: [PATCH net 1/1] driver: macvtap: Unregister netdev rx_handler if
 macvtap_newlink fails



On 2016年11月25日 10:05, fgao@...vckh6395k16k5.yundunddos.com wrote:
> From: Gao Feng <fgao@...ai8.com>
>
> The macvtap_newlink registers the netdev rx_handler firstly, but it
> does not unregister the handler if macvlan_common_newlink failed.
>
> Signed-off-by: Gao Feng <fgao@...ai8.com>
> ---
>   drivers/net/macvtap.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 070e329..bceca28 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -491,7 +491,13 @@ static int macvtap_newlink(struct net *src_net,
>   	/* Don't put anything that may fail after macvlan_common_newlink
>   	 * because we can't undo what it does.
>   	 */
> -	return macvlan_common_newlink(src_net, dev, tb, data);
> +	err = macvlan_common_newlink(src_net, dev, tb, data);
> +	if (err) {
> +		netdev_rx_handler_unregister(dev);
> +		return err;
> +	}
> +
> +	return 0;
>   }
>   
>   static void macvtap_dellink(struct net_device *dev,

Acked-by: Jason Wang <jasowang@...hat.com>