netdev - Regression caused by commit 7bb05b85bc2d ("r8169: don't use MSI-X on RTL8106e")

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Message-Id: <5D685053-1A33-4553-8678-A50C542466FD@canonical.com>
Date:   Wed, 12 Sep 2018 11:42:10 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     jian-hong@...lessm.com, Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Regression caused by commit 7bb05b85bc2d ("r8169: don't use MSI-X on
 RTL8106e")

Hi Jian-Hong,

There's a Dell machine with RTL8106e stops to work after S3 since the  
commit introduced.
So I am wondering if it's possible to revert the commit and use  
DMI/subsystem id based quirk table?

It's because of commit bc976233a872 ("genirq/msi, x86/vector: Prevent  
reservation mode for non maskable MSI") cleared the reservation mode, and I  
can see this after S3:

[   94.872838] do_IRQ: 3.33 No irq handler for vector

If the device uses MSI-X instead of MSI, the issue doesn't happen because  
of reservation mode.

Hi Thomas,

Is it something should be handled by x86 BIOS? Because I don't see this  
issue when I use Suspend-to-Idle, which doesn't use BIOS to do suspend.

Kai-Heng