Re: stmmac on Banana PI CPU stalls since Linux 6.6

On Fri, 26 Jan 2024 11:54:20 +0100
Marc Haber [off-list ref] wrote:

On Fri, Jan 26, 2024 at 08:51:22AM +0100, Petr Tesařík wrote:

quoted

On Thu, 25 Jan 2024 12:00:46 -0800
Florian Fainelli [off-list ref] wrote:  

quoted

Did not Petr try to address the same problem essentially:

https://lore.kernel.org/netdev/20240105091556.15516-1-petr@tesarici.cz/ (local)

this was not deemed the proper solution and I don't think one has been 
posted since then, but it looks about your issue here Marc.  

Yes, it looks like the same issue I ran into on my NanoPi. I'm sorry
I've been busy with other things lately, so I could not test and submit
my changes.  

Is it worth trying your patch from the message cited above, knowing that
is not the final solution?

Depends. It solves the deadlock (at least for me); my NanoPi has been
running stable for over a month with this patch. But it also introduces
a new spinlock, which usually reduces performance.

In any case, you can give it a try to verify that you hit the same
issue.

quoted

I hope I can find some time for this bug again during the coming weekend
(it's not for my day job). It's motivating to know that I'm not the
only affected person on the planet. ;-)  

I am ready to test if you want me to ;-)

Then you may want to start by verifying that it is indeed the same
issue. Try the linked patch.

Thank you!

Petr T