linux-kernel - Re: [PATCH net] can: j1939: fix errant WARN_ON_ONCE in j1939_session

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Message-Id: <20230114173546.38340-1-pchelkin@ispras.ru>
Date:   Sat, 14 Jan 2023 20:35:46 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Fedor Pchelkin <pchelkin@...ras.ru>,
        Ziyang Xuan <william.xuanziyang@...wei.com>, robin@...tonic.nl,
        linux@...pel-privat.de, Oliver Hartkopp <socketcan@...tkopp.net>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH net] can: j1939: fix errant WARN_ON_ONCE in j1939_session_deactivate

Hello,

On Fri, 10 Sep 2021 14:40:05 +0200, Oleksij Rempel wrote:
> Ok, I see, this warning makes sense only if session will actually be
> deactivated.
>
> Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>
>
> Thank you!

As Ziyang Xuan stated, the patch was not applied to upstream.

Usage of WARN_ON_ONCE in this case is actually discouraged: it erroneusly
complains in a valid situation.

So the macro should be removed with the aforementioned patch. If it makes
some sense for debugging purposes, WARN_ON_ONCE can be replaced with
netdev_warn/netdev_notice but anyway discard of WARN_ON_ONCE.

--
Regards,

Fedor