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

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Message-ID: <20180316125525.GB5035@linux.intel.com>
Date:   Fri, 16 Mar 2018 14:55:25 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, Sahil Rihan <srihan@...com>,
        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 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.

/Jarkko