linux-kernel - Re: [PATCH] r8169: don't use MSI-X on RTL8106e

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Date:   Tue, 21 Aug 2018 12:31:08 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hkallweit1@...il.com
Cc:     helgaas@...nel.org, jian-hong@...lessm.com, nic_swsd@...ltek.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...lessm.com, linux-pci@...r.kernel.org,
        marc.zyngier@....com, tglx@...utronix.de, hch@....de
Subject: Re: [PATCH] r8169: don't use MSI-X on RTL8106e

From: Heiner Kallweit <hkallweit1@...il.com>
Date: Mon, 20 Aug 2018 22:46:48 +0200

> I'm in contact with Realtek and according to them few chip versions
> seem to clear MSI-X table entries on resume from suspend. Checking
> with them how this could be fixed / worked around.
> Worst case we may have to disable MSI-X in general.

I worry that if the chip does this, and somehow MSI-X is enabled and
an interrupt is generated, the chip will write to the cleared out
MSI-X address.  This will either write garbage into memory or cause
a bus error and require PCI error recovery.

It also looks like your test patch doesn't fix things for people who
have tested it.

Hmmm...