linux-kernel - Re: [PATCH v3 07/10] net/mlx5: Use RMW accessors for changing LNKCTL

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Date:   Wed, 21 Jun 2023 16:46:23 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     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,
        Dean Luick <dean.luick@...nelisnetworks.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Moshe Shemesh <moshe@...dia.com>, stable@...r.kernel.org
Subject: Re: [PATCH v3 07/10] net/mlx5: Use RMW accessors for changing LNKCTL

On Tue, Jun 20, 2023 at 04:46:21PM +0300, 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>
> Reviewed-by: Moshe Shemesh <moshe@...dia.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)

Reviewed-by: Simon Horman <simon.horman@...igine.com>