linux-kernel - Re: [PATCH] tpm: allow TCPA log area to be empty

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Message-ID: <20180319212436.GD14364@linux.intel.com>
Date:   Mon, 19 Mar 2018 23:24:36 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Sahil Rihan <srihan@...com>
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Alexei Starovoitov <ast@...com>, stable@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: allow TCPA log area to be empty

On Sun, Mar 18, 2018 at 08:13:23PM -0600, Jason Gunthorpe wrote:
> On Fri, Mar 16, 2018 at 02:55:25PM +0200, Jarkko Sakkinen wrote:
> > On Mon, Mar 12, 2018 at 09:02:32AM -0600, Jason Gunthorpe wrote:
> > > On Sat, Mar 10, 2018 at 06:16:37PM +0200, Jarkko Sakkinen wrote:
> > > > TCPA log are can be empty when the TPM is disabled. This commit changes the
> > > > behavior of tpm_read_log_acpi() to return successfully in this case.
> > > 
> > > The commit should explain why we'd want this..
> > > 
> > > eg Why does it matter to create the extra sysfs files to report an empty
> > > log?
> > > 
> > > Jason
> > 
> > The initialization of the driver will fail otherwise. Not sure if I
> > understand your question.
> 
> Well, I mean in the sense of what is broken and why is this the right
> fix. Why not return -ENODEV?

Well, because then the device initialization would fail.

Just noticed that this is missing:

Reported-by: Sahil Rihan <srihan@...com>

Sahil, would you care to try if this fixes the issue that you are
having or not?

/Jarkko