[PATCH v6 1/3] tpm: Introduce flag TPM_TRANSMIT_RAW

From: Stefan Berger <stefanb@linux.vnet.ibm.com>
To: jarkko.sakkinen@linux.intel.com, tpmdd-devel@lists.sourceforge.net
Cc: linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, jgunthorpe@obsidianresearch.com,
	Stefan Berger <stefanb@linux.vnet.ibm.com>
Subject: [PATCH v6 1/3] tpm: Introduce flag TPM_TRANSMIT_RAW
Date: Wed, 24 May 2017 17:39:39 -0400	[thread overview]
Message-ID: <1495661981-27249-2-git-send-email-stefanb@linux.vnet.ibm.com> (raw)
In-Reply-To: <1495661981-27249-1-git-send-email-stefanb@linux.vnet.ibm.com>

Introduce the flag TPM_TRANSMIT_RAW that allows us to transmit
a command without recursing into the requesting of locality.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm-interface.c | 3 ++-
 drivers/char/tpm/tpm.h           | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 4ed08ab..2eacda2 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -416,7 +416,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
 	/* Store the decision as chip->locality will be changed. */
 	need_locality = chip->locality == -1;
 
-	if (need_locality && chip->ops->request_locality)  {
+	if (!(flags & TPM_TRANSMIT_RAW) &&
+	    need_locality && chip->ops->request_locality)  {
 		rc = chip->ops->request_locality(chip, 0);
 		if (rc < 0)
 			goto out_no_locality;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index e81d8c7..25d9858 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -525,6 +525,7 @@ extern struct idr dev_nums_idr;
 
 enum tpm_transmit_flags {
 	TPM_TRANSMIT_UNLOCKED	= BIT(0),
+	TPM_TRANSMIT_RAW	= BIT(1),
 };
 
 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
-- 
2.4.3
