linux-kernel - Re: [PATCH v3 3/5] tpm: migrate tpm2_probe() to use struct tpm

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Message-ID: <20180319144205.GA4619@linux.intel.com>
Date:   Mon, 19 Mar 2018 16:42:05 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] tpm: migrate tpm2_probe() to use struct tpm_buf

On Fri, Mar 16, 2018 at 08:36:52AM -0400, Mimi Zohar wrote:
> On Fri, 2018-03-16 at 14:21 +0200, Jarkko Sakkinen wrote:
> > On Mon, Mar 05, 2018 at 05:52:24PM -0500, Mimi Zohar wrote:
> > > Hi Jarrko,
> > > 
> > > On Mon, 2018-03-05 at 18:56 +0200, Jarkko Sakkinen wrote:
> > > > In order to make struct tpm_buf the first class object for constructing TPM
> > > > commands, migrate tpm2_probe() to use it.
> > > > 
> > > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > > 
> > > With this patch, the Pi doesn't find the TPM.  I'm seeing the
> > > following line in dmesg.
> > > 
> > > [    1.087414] tpm_tis_spi: probe of spi0.0 failed with error 256
> > 
> > Thank you for reporting this Mimi. Does it have TPM1/TPM2?
> 
> The pi has a TPM 2.0 attached to the GPIO.  James pointed out the
> change in return codes.
> 
> 
> +       if (be16_to_cpu(out->tag) == TPM2_ST_NO_SESSIONS)
>                 chip->flags |= TPM_CHIP_FLAG_TPM2;
> -
> -       return 0;
> +out:
> +       tpm_buf_destroy(&buf);
> +       return rc;
>  }
>  EXPORT_SYMBOL_GPL(tpm2_probe);
> 
> Mimi

Oops, thank you James and Mimi for pointing this out. I'll refine
the patch set.

/Jarkko