linux-kernel - Re: [PATCH v11 00/16] Remove nested TPM operations

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Date:   Fri, 8 Feb 2019 15:02:27 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     Alexander Steffen <Alexander.Steffen@...ineon.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Peter Huewe <PeterHuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [PATCH v11 00/16] Remove nested TPM operations

On Fri, Feb 08, 2019 at 07:05:26AM -0500, Stefan Berger wrote:
> See my comment on [PATCH v11 08/16]. It needs to be added in that patch
> since otherwise rc holds a non-zero value on function exit, which is wrong
> at that point.

The snippet in question:

rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
	if (rc != -EPIPE)
		dev_err(&chip->dev,
			"%s: tpm_send: error %d\n", __func__, rc);
	return rc;
}

if (chip->flags & TPM_CHIP_FLAG_IRQ)
	goto out_recv;

'send()' ought to return zero on success case.

This is how the snippet was before applying any patches scheduled for
v5.1:

rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
	if (rc != -EPIPE)
		dev_err(&chip->dev,
			"%s: tpm_send: error %d\n", __func__, rc);
	return rc;
}

if (chip->flags & TPM_CHIP_FLAG_IRQ)
	goto out_recv;

Does not compute.

/Jarkko