linux-kernel - Re: [net-next RFC 2/8] macvtap: return -EBADFD when TUNGETIFF fails

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Message-ID: <20130523115423.GF17993@redhat.com>
Date:	Thu, 23 May 2013 14:54:23 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC 2/8] macvtap: return -EBADFD when TUNGETIFF fails

On Thu, May 23, 2013 at 11:12:27AM +0800, Jason Wang wrote:
> Tuntap return -EBADFD when TUNGETIFF fails, we should return the same value.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Can you add some more comments on why this matters?
Any userspace that cares will have to handle both, right?

> ---
>  drivers/net/macvtap.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 59e9605..ce1c72a 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -928,7 +928,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
>  		rcu_read_unlock_bh();
>  
>  		if (!vlan)
> -			return -ENOLINK;
> +			return -EBADFD;
>  
>  		ret = 0;
>  		if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
> -- 
> 1.7.1
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