linux-kernel - [PATCH v5 1/2] tpm: Introduce flag TPM_TRANSMIT

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Date:   Mon, 15 May 2017 12:51:44 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        jarkko.sakkinen@...ux.intel.com
Cc:     jgunthorpe@...idianresearch.com, linux-kernel@...r.kernel.org,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>
Subject: [PATCH v5 1/2] tpm: Introduce flag TPM_TRANSMIT_RAW

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

Signed-off-by: Stefan Berger <stefanb@...ux.vnet.ibm.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