linux-kernel - Re: [PATCH 0/2] Revert patches fixing probing of interrupts

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Date:   Mon, 9 Dec 2019 21:42:48 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 0/2] Revert patches fixing probing of interrupts

On Mon, Dec 02, 2019 at 11:55:20AM -0700, Jerry Snitselaar wrote:
> On Sun Dec 01 19, Stefan Berger wrote:
> > On 11/29/19 5:37 PM, Jarkko Sakkinen wrote:
> > > On Tue, Nov 26, 2019 at 08:17:51AM -0500, Stefan Berger wrote:
> > > > From: Stefan Berger <stefanb@...ux.ibm.com>
> > > > 
> > > > Revert the patches that were fixing the probing of interrupts due
> > > > to reports of interrupt stroms on some systems
> > > Can you explain how reverting is going to fix the issue?
> > 
> > 
> > The reverts fix 'the interrupt storm issue' that they are causing on
> > some systems but don't fix the issue with the interrupt mode not being
> > used. I was hoping Jerry would get access to a system faster but this
> > didn't seem to be the case. So sending these patches seemed the better
> > solution than leaving 5.4.x with the problem but going back to when it
> > worked 'better.'
> > 
> 
> I finally heard back from IT support, and unfortunately they don't
> have any T490s systems to give out on temp loan. So I can only send
> patched kernels to the end user that had the problem.

At least it is a fact that tpm_chip_stop() is called too early and that
is destined to cause issues.

Should I bake a patch or do you have already something?

/Jarkko