linux-kernel - Re: Getting weird TPM error after rebasing my tree to security/next-general

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Message-ID: <1547849358.2794.90.camel@HansenPartnership.com>
Date:   Fri, 18 Jan 2019 14:09:18 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Getting weird TPM error after rebasing my tree to
 security/next-general

On Fri, 2019-01-18 at 16:25 +0200, Jarkko Sakkinen wrote:
> I get this on a Geminilake NUC after rebasing my maintainer trees:
> 
> tpm tpm0: A TPM error (-1) occurred attempting the self test
> 
> I checked the latest commit ID from drivers/char/tpm to make sure
> that I did not put anything broken to my last PR [1]. It works
> without issues.
> 
> In addition [2] gives me an empty diff.
> 
> Something outside of the TPM driver must have happened that breaks
> the driver. Any ideas?
> 
> [1] commit 9488585b21bef0df1217e510c7134905d1d376a7
> [2] git diff 9488585b21bef0df1217e510c7134905d1d376a7 master
> drivers/char/tpm/

I'm afraid you're going to have to bisect to find the offending in-
kernel commit, which is going to be painful since it seems to depend on
physical hardware.  My first instinct is that we're getting a zero
length read somewhere, but I still can't see anything in the merge
window that would cause that behaviour.

James