Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754115AbdCMQgy (ORCPT ); Mon, 13 Mar 2017 12:36:54 -0400 Received: from quartz.orcorp.ca ([184.70.90.242]:39650 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752002AbdCMQfU (ORCPT ); Mon, 13 Mar 2017 12:35:20 -0400 Date: Mon, 13 Mar 2017 10:34:52 -0600 From: Jason Gunthorpe To: Jarkko Sakkinen Cc: tpmdd-devel@lists.sourceforge.net, linux-security-module@vger.kernel.org, Jerry Snitselaar , gang.wei@intel.com, Peter Huewe , Marcel Selhorst , open list Subject: Re: [PATCH v2] tpm_crb: request and relinquish locality 0 Message-ID: <20170313163452.GD22997@obsidianresearch.com> References: <20170311130216.21419-1-jarkko.sakkinen@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170311130216.21419-1-jarkko.sakkinen@linux.intel.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Broken-Reverse-DNS: no host name found for IP address 10.0.0.156 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1751 Lines: 49 On Sat, Mar 11, 2017 at 03:02:14PM +0200, Jarkko Sakkinen wrote: > Added two new callbacks to struct tpm_class_ops: > > - request_locality > - relinquish_locality > > These are called before sending and receiving data from the TPM. We > update also tpm_tis_core to use these callbacks. Small modification to > request_locality() is done so that it returns -EBUSY instead of locality > number when check_locality() fails. Make sense I think you may as well do the other two drivers, even though you can't run them the transformation looks safe enough to me. > Signed-off-by: Jarkko Sakkinen > drivers/char/tpm/tpm-interface.c | 9 +++++++++ > drivers/char/tpm/tpm_crb.c | 41 +++++++++++++++++++++++++++++++++++++++- > drivers/char/tpm/tpm_tis_core.c | 12 ++++-------- > include/linux/tpm.h | 3 ++- > 4 files changed, 55 insertions(+), 10 deletions(-) > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c > index e38c792..9c56581 100644 > +++ b/drivers/char/tpm/tpm-interface.c > @@ -407,6 +407,12 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, > if (chip->dev.parent) > pm_runtime_get_sync(chip->dev.parent); > > + if (chip->ops->request_locality) { > + rc = chip->ops->request_locality(chip, 0); > + if (rc) > + goto out; If request_locality fails we probably shouldn't call relinquish_locality on the unwind path.. I think you should also put a relinquish_locality inside tpm_remove ? > + int (*request_locality)(struct tpm_chip *chip, int loc); > + void (*relinquish_locality)(struct tpm_chip *chip, int loc, > bool force); Let us document what force is supposed to do... I'm not sure why we have it? Jason