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

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Message-ID: <f96e4a8a-1b69-a783-d1ca-7d8e48100954@gmail.com>
Date:   Thu, 11 May 2023 22:11:32 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Lukas Wunner <lukas@...ner.de>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczy?ski <kw@...ux.com>, 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 11.05.2023 22:10, Lukas Wunner wrote:
> On Thu, May 11, 2023 at 11:00:02PM +0300, Ilpo Järvinen wrote:
>> 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.
> 
> That discussion wasn't cc'ed to Heiner.  For reference, this is the
> message Ilpo is referring to:
> 
> https://lore.kernel.org/linux-pci/ZF1AjOKDVlbNFJPK@bhelgaas/

Thanks for the link!