netdev - RTL8402 stops working after hibernate/resume

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Message-ID: <20200715102820.7207f2f8@ezekiel.suse.cz>
Date:   Wed, 15 Jul 2020 10:28:20 +0200
From:   Petr Tesarik <ptesarik@...e.cz>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org
Subject: RTL8402 stops working after hibernate/resume

Hi all,

I've encountered some issues on an Asus laptop. The RTL8402 receive
queue behaves strangely after suspend to RAM and resume - many incoming
packets are truncated, but not all and not always to the same length
(most commonly 60 bytes, but I've also seen 150 bytes and other
lengths).

Reloading the driver can fix the problem, so I believe we must be
missing some initialization on resume. I've already done some
debugging, and the interface is not running when rtl8169_resume() is
called, so __rtl8169_resume() is skipped, which means that almost
nothing is done on resume.

Some more information can be found in this openSUSE bug report:

https://bugzilla.opensuse.org/show_bug.cgi?id=1174098

The laptop is not (yet) in production, so I can do further debugging if
needed.

Petr T

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