linux-kernel - Re: [PATCH net v1 1/1] ethtool: fix clearing of WoL flags

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Message-ID: <20231019152743.09b28ef4@kmaincent-XPS-13-7390>
Date:   Thu, 19 Oct 2023 15:27:43 +0200
From:   Köry Maincent <kory.maincent@...tlin.com>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net v1 1/1] ethtool: fix clearing of WoL flags

On Thu, 19 Oct 2023 12:50:48 +0200
Michal Kubecek <mkubecek@...e.cz> wrote:

> On Thu, Oct 19, 2023 at 12:21:14PM +0200, Köry Maincent wrote:
> > On Thu, 19 Oct 2023 11:51:40 +0200 > Michal Kubecek <mkubecek@...e.cz>
> > wrote:  
> > > 
> > > The issue was indeed introduced by commit 108a36d07c01 ("ethtool: Fix
> > > mod state of verbose no_mask bitset"). The problem is that a "no mask"
> > > verbose bitset only contains bit attributes for bits to be set. This
> > > worked correctly before this commit because we were always updating
> > > a zero bitmap (since commit 6699170376ab ("ethtool: fix application of
> > > verbose no_mask bitset"), that is) so that the rest was left zero
> > > naturally. But now the 1->0 change (old_val is true, bit not present in
> > > netlink nest) no longer works.  
> > 
> > Doh I had not seen this issue! Thanks you for reporting it.
> > I will send the revert then and will update the fix for next merge-window.  
> 
> Something like the diff below (against current mainline) might do the
> trick but it's just an idea, not even build tested.

Seems a good idea without adding too much complexity to the code.
Will try that and send it in next merge window.

Köry