RE: lan78xx: WARNING: irq 79 handler enabled interrupts

Hi Stefan,

Thanks for information and creating a ticket.

Did quick check on a PC machine with 4.20 rc. However, not seeing same warning.
Look need time to repro and get details on same build & target you are using.

Regards,
Woojung

-----Original Message-----
From: Stefan Wahren <redacted>
Sent: Tuesday, January 1, 2019 4:32 PM
To: Woojung Huh - C21699 <Woojung.Huh@microchip.com>
Cc: eric@anholt.net; UNGLinuxDriver <UNGLinuxDriver@microchip.com>; marc.zyngier@arm.com;
netdev@vger.kernel.org; linux-arm-kernel@lists.infradead.org
Subject: RE: lan78xx: WARNING: irq 79 handler enabled interrupts

Hi Woojung,

quoted

Woojung.Huh@microchip.com hat am 30. Dezember 2018 um 04:25 geschrieben:


HI Marc & Stephen,

Most of engineers are out until New Year's Day.

thanks. I didn't expect a reply that fast.

quoted

LAN78xx driver uses irq_domain for phy interrupt, but smsc95xx uses polling.
Need to check flow again, you can try that comment out "lan78xx_setup_irq_domain" to
make dev->domain_data.phyirq = 0 which forces PHY polling.

I tested your suggestion with multi_v7_defconfig (32 bit) and arm64/defconfig.
The warning disappeared and Ethernet is still working.

Only the old issue that we can't receive until a first packet has been send out reappear. But this should
be manageable.

quoted

Can you share if this is filed on RPI forum?

I didn't submit this to the raspberrypi.org forum / github. They mostly care about the next LTS release
4.19 and not really about arm64.

But an Arch Linux user (aarch64 using Mainline kernel) already discovered this issue:
https://archlinuxarm.org/forum/viewtopic.php?f=65&t=13302

quoted

Also, it would be appreciated if you can create a ticket on Microchip site at
https://www.microchip.com/technical-support/hot-topics

Done

Best regards
Stefan

quoted

Best Regards,
Woojung