netdev - Re: [patch net-next] net: call notifiers for mtu change even if iface is not up

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Message-ID: <20121203141823.GA21816@hmsreliant.think-freely.org>
Date:	Mon, 3 Dec 2012 09:18:23 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	bhutchings@...arflare.com, psimerda@...hat.com
Subject: Re: [patch net-next] net: call notifiers for mtu change even if
 iface is not up

On Mon, Dec 03, 2012 at 12:16:32PM +0100, Jiri Pirko wrote:
> Do the same thing as in set mac. Call notifiers every time.
> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> ---
>  net/core/dev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 2f94df2..0685a72 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -4971,7 +4971,7 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
>  	else
>  		dev->mtu = new_mtu;
>  
> -	if (!err && dev->flags & IFF_UP)
> +	if (!err)
>  		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
>  	return err;
>  }

I'm not opposed to this change, but is there something that it expressly fixes?
While it doesn't hurt to send around mtu change events, one would presume that
listeners would pick up mtu changes when the NETDEV_UP event went' around.

Neil

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