netdev - RE: [PATCH net] r8169: fix rtl8125b dmar pte write access not set error

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Message-ID: <25c7b354dff14ed381f91963f134a87c@realtek.com>
Date:   Wed, 5 Oct 2022 05:44:22 +0000
From:   Hau <hau@...ltek.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "grundler@...omium.org" <grundler@...omium.org>
Subject: RE: [PATCH net] r8169: fix rtl8125b dmar pte write access not set error

> On 04.10.2022 10:10, Chunhao Lin wrote:
> > When close device, rx will be enabled if wol is enabeld. When open
> > device it will cause rx to dma to wrong address after pci_set_master().
> >
> Hi Hau,
> 
> I never experienced this problem. Is it an edge case that can occur under
> specific circumstances?
> 

This issue is happen on google chromebook with IOMMU enabled. Because rx is enabled when wol is enabled, 
so I think there is a chance that the packet receive in device close will be dma to invalid memory address when
device is open.

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