linux-kernel - Re: [PATCH net-next] net: fec: Always call fec

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Date: Wed, 14 Feb 2024 06:52:21 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: John Ernberg <john.ernberg@...ia.se>
Cc: Wei Fang <wei.fang@....com>, Shenwei Wang <shenwei.wang@....com>, "Clark
 Wang" <xiaoning.wang@....com>, NXP Linux Team <linux-imx@....com>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 "Paolo Abeni" <pabeni@...hat.com>, "netdev@...r.kernel.org"
 <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: fec: Always call fec_restart() in resume
 path

On Wed, 14 Feb 2024 08:27:02 +0000 John Ernberg wrote:
> You are correct, we thought so too at [1], but bisection is really hard 
> because we need a whole bunch of patches on top to even boot the system 
> (imx8qxp specific stuff in the NXP vendor tree that's difficult to 
> rebase), we left it a bit open ended.
> 
> Over the course of the weekend I lost all confidence in my bisection 
> after being confident for 4-5 days, because the more I thought about it 
> the less it made sense for that commit to be the culprit.
> 
> I should probably have both followed up on that mail with that, and been 
> clearer here. I apologize for failing that.

Is it perhaps possible that upstream 5.10 also didn't work?
I'm not saying the change itself is incorrect, indeed there 
is fec_restart() on probe and open paths, as you say.
Did you try reverting as many of the changes that happened
in the meantime as possible (instead of bisection)?

The other question is whether we need to enable any of the
clocks or runtime resume before calling fec_restart()?