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Date:   Tue, 3 May 2022 10:26:12 +0200
From:   Lukas Wunner <lukas@wunner.de>
To:     Ferry Toth <fntoth@gmail.com>
Cc:     Steve Glendinning <steve.glendinning@shawell.net>,
        UNGLinuxDriver@microchip.com, Oliver Neukum <oneukum@suse.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-usb@vger.kernel.org, Andre Edich <andre.edich@microchip.com>,
        Oleksij Rempel <o.rempel@pengutronix.de>,
        Martyn Welch <martyn.welch@collabora.com>,
        Gabriel Hojda <ghojda@yo2urs.ro>,
        Christoph Fritz <chf.fritz@googlemail.com>,
        Lino Sanfilippo <LinoSanfilippo@gmx.de>,
        Philipp Rosenberger <p.rosenberger@kunbus.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Russell King <linux@armlinux.org.uk>
Subject: Re: [PATCH net-next 0/7] Polling be gone on LAN95xx
Message-ID: <20220503082612.GA21515@wunner.de>
References: <cover.1651037513.git.lukas@wunner.de>
 <a9fcc952-a55f-1eae-c584-d58644bae00d@gmail.com>
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On Mon, May 02, 2022 at 10:33:06PM +0200, Ferry Toth wrote:
> Op 27-04-2022 om 07:48 schreef Lukas Wunner:
> > Do away with link status polling on LAN95XX USB Ethernet
> > and rely on interrupts instead, thereby reducing bus traffic,
> > CPU overhead and improving interface bringup latency.
> 
> Tested-by: Ferry Toth <fntoth@gmail.com> (Intel Edison-Arduino)

Thank you!

> While testing I noted another problem. I have "DMA-API: debugging enabled by
> kernel config" and this (I guess) shows me before and after the patches:
> 
> ------------[ cut here ]------------
> DMA-API: xhci-hcd xhci-hcd.1.auto: cacheline tracking EEXIST, overlapping
> mappings aren't supported

That is under investigation here:
https://bugzilla.kernel.org/show_bug.cgi?id=215740

It's apparently a long-standing bug in the USB core which was exposed
by a new WARN() check introduced in 5.14.

Thanks,

Lukas