netdev - Re: [PATCH v2 8/9] wifi: ath12k: Use RMW accessors for changing LNKCTL

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Date: Wed, 17 May 2023 14:03:57 +0300
From: Kalle Valo <kvalo@...nel.org>
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>,  "David S. Miller" <davem@...emloft.net>,  Eric
 Dumazet <edumazet@...gle.com>,  Jakub Kicinski <kuba@...nel.org>,  Paolo
 Abeni <pabeni@...hat.com>,  Sriram R <quic_srirrama@...cinc.com>,  P
 Praneesh <quic_ppranees@...cinc.com>,  Ramya Gnanasekar
 <quic_rgnanase@...cinc.com>,  Karthikeyan Periyasamy
 <quic_periyasa@...cinc.com>,  Vasanthakumar Thiagarajan
 <quic_vthiagar@...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 v2 8/9] wifi: ath12k: Use RMW accessors for changing LNKCTL

Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> writes:

> 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>
> Cc: stable@...r.kernel.org

Acked-by: Kalle Valo <kvalo@...nel.org>

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