netdev - Re: [PATCH] ravb: implement MTU change while device is up

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Message-ID: <20190520120954.ffz2ius5nvojkxlh@katana>
Date:   Mon, 20 May 2019 14:09:54 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Simon Horman <horms@...ge.net.au>
Cc:     Ulrich Hecht <uli@...nd.eu>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        davem@...emloft.net, magnus.damm@...il.com
Subject: Re: [PATCH] ravb: implement MTU change while device is up


> > > > > >    How about the code below instead?
> > > > > > 
> > > > > > 	if (netif_running(ndev))
> > > > > > 		ravb_close(ndev);
> > > > > > 
> > > > > >  	ndev->mtu = new_mtu;
> > > > > > 	netdev_update_features(ndev);
> > > > > 
> > > > > Is there a need to call netdev_update_features() even if the if is not 
> > > > > running?
> > > > 
> > > > In my testing, it didn't seem so.
> > > 
> > > That may be because your testing doesn't cover cases where it would make
> > > any difference.
> > 
> > Cases other than changing the MTU while the device is up?
> 
> I was thinking of cases where listeners are registered for the
> notifier that netdev_update_features() triggers.

Where are we here? Is this a blocker?


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