linux-kernel - Re: r8169: disable ASPM during NAPI poll locking changes --> BUG: Invalid wait context --> PREEMPT

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Date:   Mon, 22 May 2023 15:43:15 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: r8169: disable ASPM during NAPI poll locking changes --> BUG:
 Invalid wait context --> PREEMPT_RT pain

On 2023-05-22 12:41:21 [+0200], Mike Galbraith wrote:
> > I've been looking at the r8169 the other day and it seemed all good
> > since it was only scheduling workqueues and NAPI. But now I see this
> > mac_ocp_lock + config25_lock which are acquire in hardirq context but
> > can't. This needs to be taken care.
> 
> I did a patch converting the locks, but didn't post it hoping maybe
> those locks weren't really really needed.  It doesn't matter for my
> box, as it doesn't do anything but give RT chances to trip over bugs.

I missed that part. Do you still see those 160us if you keep the locks
as-it as drop the no-threads flag? I'm trying to figure out if this is
due to hwirq context or just blocked PCI-bus due ASPM.

> 	-Mike

Sebastian