linux-kernel - Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error interrupts unmasking

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Message-ID: <708d29de-b54a-40a4-8879-67f6e246f851@lunn.ch>
Date: Mon, 13 May 2024 15:00:48 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Ramón Nordin Rodriguez <ramon.nordin.rodriguez@...roamp.se>
Cc: Piergiorgio Beruto <Pier.Beruto@...emi.com>,
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Subject: Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error
 interrupts unmasking

> I've enabled some debugging options but so far nothing seems to hit.
> What I've been able to conclude is that there still is SPI
> communication, the macphy interrupt is still pulled low, and the cpu
> does the ack so that it's reset to inactive.

Is it doing this in an endless cycle?

Probably the debug tools are not showing anything because it is not
looping in just one location. It is a complex loop, interrupts
triggering a thread which runs to completion etc. So it looks like
normal behaviour.

If it is an endless cycle, it sounds like an interrupt storm. Some
interrupt bit is not getting cleared, so it immediately fires again as
soon as interrupts are enabled.

Is this your dual device board? Do you have both devices on the same
SPI bus? Do they share interrupt lines?

	Andrew