Re: [PATCH AUTOSEL 4.19 126/167] tpm: Fix TPM 1.2 Shutdown sequence to prevent future TPM operations

From: Sasha Levin
Date: Wed Sep 11 2019 - 03:56:08 EST

On Mon, Sep 09, 2019 at 05:28:08PM +0100, Jarkko Sakkinen wrote:
On Sat, Sep 07, 2019 at 06:04:48PM -0400, Sasha Levin wrote:
On Sat, Sep 07, 2019 at 09:55:18PM +0300, Jarkko Sakkinen wrote:
> On Tue, 2019-09-03 at 15:43 -0400, Sasha Levin wrote:
> > Right. I gave a go at backporting a few patches and this happens to be
> > one of them. It will be a while before it goes in a stable tree
> > (probably way after after LPC).
> It *semantically* depends on
> db4d8cb9c9f2 ("tpm: use tpm_try_get_ops() in tpm-sysfs.c.")
> I.e. can cause crashes without the above patch. As a code change your
> patch is fine but it needs the above patch backported to work in stable
> manner.
> So... either I can backport that one (because ultimately I have
> responsibility to do that as the maintainer) but if you want to finish
> this one that is what you need to backport in addition and then it
> should be fine.

If you're ok with the backport of this commit, I can just add
db4d8cb9c9f2 on top.

Sure, I've already gave my promise to do that :-)

I think that the dependency in question is actually:

2677ca98ae377 ("tpm: use tpm_try_get_ops() in tpm-sysfs.c.")

Which is tricky to backport. I think I'll drop this patch for now and
wait for your backport instead.