linux-kernel - Re: [PATCH v1 11/12] tpm: Driver for TPM 2.0 CRB Interface

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Date:	Wed, 24 Sep 2014 11:05:51 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 11/12] tpm: Driver for TPM 2.0 CRB Interface

On Wed, Sep 24, 2014 at 12:06:01PM +0300, Jarkko Sakkinen wrote:

> +	offset = cca->rsp_pa - priv->cca_pa;
> +	resp = (u8 *) ((unsigned long) cca + offset);
> +	memcpy(buf, resp, 6);
> +	expected = be32_to_cpu(*(__be32 *) (buf + 2));

be32_to_cpup?

> +static void crb_release(void *data)
> +{
> +	struct tpm_chip *chip = (struct tpm_chip *) data;
> +	tpm_remove_hardware(chip->dev);
> +}

Please use a proper remove function on the device driver, not a devm
function like this. 'tpm_remove_hardware' is the wrong name for a new
API, it must be 'tpm_chip_unregister' (ie the undo of 'tpm_chip_register')

> +static int crb_acpi_add(struct acpi_device *device)
> +{
> +	struct tpm_chip *chip;
> +	struct acpi_tpm2 *buf;
> +	struct crb_priv *priv;
> +	struct device *dev = &device->dev;
> +	acpi_status status;
> +	u32 sm;
> +	int rc;
> +
> +	chip = tpm_chip_alloc(dev, &tpm_crb);
> +	if (!chip)
> +		return -ENODEV;

Lets use ERRPTR here

> +	chip->tpm2 = true;
> +
> +	rc = tpm_chip_register(chip);

This is in the wrong place, it needs to be the last call in the probe
function - the driver must be fully operational when register is
called, that is one of the bugs the new interface must be fixing.

> +	rc = tpm_do_selftest(chip);
> +	if (rc) {
> +		rc = -ENODEV;
> +		goto out_err;
> +	}

The common TPM command startup sequence should be in
tpm_chip_register(), so move this into there.

> +	rc = devm_add_action(dev, crb_release, chip);
> +	if (rc)
> +		goto out_err;
> +
> +	return 0;
> +out_err:
> +	tpm_remove_hardware(chip->dev);
> +	return rc;
> +}
> +
> +static struct acpi_device_id crb_device_ids[] = {

const? Not sure

Jason
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