linux-kernel - Re: [PATCH net-next v3] net/tun: Call netdev notifiers

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Message-ID: <20201117163245.4ff522ef@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Tue, 17 Nov 2020 16:32:45 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Martin Schiller <ms@....tdt.de>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3] net/tun: Call netdev notifiers

On Mon, 16 Nov 2020 11:41:21 +0100 Martin Schiller wrote:
> Call netdev notifiers before and after changing the device type.
> 
> Signed-off-by: Martin Schiller <ms@....tdt.de>
> ---
> 
> Change from v2:
> use subject_prefix 'net-next' to fix 'fixes_present' issue
> 
> Change from v1:
> fix 'subject_prefix' and 'checkpatch' warnings
> 
> ---
>  drivers/net/tun.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 3d45d56172cb..2d9a00f41023 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -3071,9 +3071,13 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
>  				   "Linktype set failed because interface is up\n");
>  			ret = -EBUSY;
>  		} else {
> +			call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
> +						 tun->dev);

This call may return an error (which has to be unpacked with
notifier_to_errno()).

>  			tun->dev->type = (int) arg;
>  			netif_info(tun, drv, tun->dev, "linktype set to %d\n",
>  				   tun->dev->type);
> +			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
> +						 tun->dev);
>  			ret = 0;
>  		}
>  		break;