linux-kernel - Re: [PATCH v2 6/9] net/mlx5: Use RMW accessors for changing LNKCTL

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Message-ID: <fdd518db-a759-b520-fb1e-d697d6f08682@nvidia.com>
Date:   Wed, 17 May 2023 14:18:58 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-pci@...r.kernel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        "Saeed Mahameed" <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Moshe Shemesh <moshe@...lanox.com>, <netdev@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Dean Luick <dean.luick@...nelisnetworks.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] net/mlx5: Use RMW accessors for changing LNKCTL


On 5/17/2023 1:52 PM, Ilpo Järvinen wrote:
> Don't assume that only the driver would be accessing LNKCTL of the
> upstream bridge. ASPM policy changes can trigger write to LNKCTL
> outside of driver's control.
>
> Use RMW capability accessors which do proper locking to avoid losing
> concurrent updates to the register value.
>
> Fixes: eabe8e5e88f5 ("net/mlx5: Handle sync reset now event")
> Suggested-by: Lukas Wunner<lukas@...ner.de>
> Signed-off-by: Ilpo Järvinen<ilpo.jarvinen@...ux.intel.com>
> Cc:stable@...r.kernel.org
Reviewed-by: Moshe Shemesh <moshe@...dia.com>

Thanks!