linux-kernel - Re: [PATCH net] Revert "ethtool: Fix mod state of verbose no

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Date:   Thu, 19 Oct 2023 15:56:03 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Kory Maincent <kory.maincent@...tlin.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Simon Horman <horms@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        stable@...r.kernel.org, Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [PATCH net] Revert "ethtool: Fix mod state of verbose no_mask
 bitset"

On Thu, Oct 19, 2023 at 03:16:41PM +0200, Kory Maincent wrote:
> This reverts commit 108a36d07c01edbc5942d27c92494d1c6e4d45a0.
> 
> It was reported that this fix breaks the possibility to remove existing WoL
> flags. For example:
> ~$ ethtool lan2
> ...
>         Supports Wake-on: pg
>         Wake-on: d
> ...
> ~$ ethtool -s lan2 wol gp
> ~$ ethtool lan2
> ...
>         Wake-on: pg
> ...
> ~$ ethtool -s lan2 wol d
> ~$ ethtool lan2
> ...
>         Wake-on: pg
> ...
> 
> 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.
> 
> Reported-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Reported-by: Michal Kubecek <mkubecek@...e.cz>
> Closes: https://lore.kernel.org/netdev/20231019095140.l6fffnszraeb6iiw@lion.mk-sys.cz/
> Cc: stable@...r.kernel.org
> Fixes: 108a36d07c01 ("ethtool: Fix mod state of verbose no_mask bitset")
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>

Reviewed-by: Michal Kubecek <mkubecek@...e.cz>

> ---
> 
> This patch is reverted for now as we are approaching the end of the
> merge-window. The real fix that fix the mod value will be sent later
> on the next merge-window.
> ---

For the record, the term "merge window" is used for the 2-week interval
between a final and following rc1, not for the whole interval between
two final releases. 

Michal

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