linux-kernel - Re: [PATCH v2] tpm: tpm_ibm

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Date:   Mon, 08 Jul 2019 18:11:40 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Nayna Jain <nayna@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Suchanek <msuchanek@...e.de>,
        Peter Huewe <peterhuewe@....de>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH v2] tpm: tpm_ibm_vtpm: Fix unallocated banks

On Sat, 2019-07-06 at 20:18 -0400, Nayna Jain wrote:
> +/*
> + * tpm_get_pcr_allocation() - initialize the chip allocated banks for PCRs
> + * @chip: TPM chip to use.
> + */
> +static int tpm_get_pcr_allocation(struct tpm_chip *chip)
> +{
> +	int rc;
> +
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		rc = tpm2_get_pcr_allocation(chip);
> +	else
> +		rc = tpm1_get_pcr_allocation(chip);
> +
> +	return rc;
> +}

It is just a trivial static function, which means that kdoc comment is
not required and neither it is useful. Please remove that. I would
rewrite the function like:

static int tpm_get_pcr_allocation(struct tpm_chip *chip)
{
	int rc;

	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) ?
     	     tpm2_get_pcr_allocation(chip) :
     	     tpm1_get_pcr_allocation(chip);

	return rc > 0 ? -ENODEV : rc;
}

This addresses the issue that Stefan also pointed out. You have to
deal with the TPM error codes.

/Jarkko