linux-kernel - Re: [PATCH 14/17] r8169: Use pcie_lnkctl_clear_and

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Message-ID: <985b617-c5d7-dce3-318b-f2f8412beed3@linux.intel.com>
Date:   Thu, 11 May 2023 23:00:02 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Lukas Wunner <lukas@...ner.de>, nic_swsd@...ltek.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/17] r8169: Use pcie_lnkctl_clear_and_set() for changing
 LNKCTL

On Thu, 11 May 2023, Heiner Kallweit wrote:

> On 11.05.2023 15:14, 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 pcie_lnkctl_clear_and_set() which does proper locking to avoid
> > losing concurrent updates to the register value.
> > 
> 
> Wouldn't it be more appropriate to add proper locking to the
> underlying pcie_capability_clear_and_set_word()?

As per discussion for the other patch, that's where this series is now 
aiming to in v2.

-- 
 i.