linux-kernel - Re: [PATCH v3 09/10] wifi: ath12k: Use RMW accessors for changing LNKCTL

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Message-ID: <ZJMNiEw0IekR684V@corigine.com>
Date:   Wed, 21 Jun 2023 16:47:36 +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>, Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Pradeep Kumar Chitrapu <quic_pradeepc@...cinc.com>,
        P Praneesh <quic_ppranees@...cinc.com>,
        Bhagavathi Perumal S <quic_bperumal@...cinc.com>,
        Jeff Johnson <quic_jjohnson@...cinc.com>,
        Karthikeyan Periyasamy <quic_periyasa@...cinc.com>,
        ath12k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dean Luick <dean.luick@...nelisnetworks.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 09/10] wifi: ath12k: Use RMW accessors for changing
 LNKCTL

On Tue, Jun 20, 2023 at 04:46:23PM +0300, Ilpo Järvinen wrote:
> Don't assume that only the driver would be accessing LNKCTL. 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. On restore, clear the ASPMC
> field properly.
> 
> Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
> Suggested-by: Lukas Wunner <lukas@...ner.de>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Acked-by: Kalle Valo <kvalo@...nel.org>
> Cc: stable@...r.kernel.org
> ---
>  drivers/net/wireless/ath/ath12k/pci.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)

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