linux-kernel - [PATCH 6/6] tpm: move TPM space code out of tpm

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Message-Id: <20181103040820.23360-7-jarkko.sakkinen@linux.intel.com>
Date:   Sat,  3 Nov 2018 06:08:20 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     linux-security-module@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 6/6] tpm: move TPM space code out of tpm_transmit()

Prepare and commit TPM space before and after calling tpm_transmit()
instead of doing that inside tpm_transmit(). After this change we can
remove TPM_TRANSMIT_NESTED flag.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 drivers/char/tpm/tpm-dev-common.c | 31 ++++++++++++++++++++++++++++---
 drivers/char/tpm/tpm-interface.c  | 21 ---------------------
 2 files changed, 28 insertions(+), 24 deletions(-)

diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
index cbb0ee30b511..22c7ac819662 100644
--- a/drivers/char/tpm/tpm-dev-common.c
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -30,13 +30,38 @@ static DEFINE_MUTEX(tpm_dev_wq_lock);
 static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
 				u8 *buf, size_t bufsiz)
 {
-	ssize_t ret;
+	struct tpm_output_header *header = (void *)buf;
+	ssize_t ret, len;
 
 	mutex_lock(&chip->tpm_mutex);
-	ret = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
+	ret = tpm2_prepare_space(chip, space, buf, bufsiz);
+	/* If the command is not implemented by the TPM, synthesize a
+	 * response with a TPM2_RC_COMMAND_CODE return for user-space.
+	 */
+	if (ret == -EOPNOTSUPP) {
+		header->length = cpu_to_be32(sizeof(*header));
+		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
+		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
+						  TSS2_RESMGR_TPM_RC_LAYER);
+		ret = sizeof(*header);
+		goto out;
+	}
+	if (ret)
+		goto out;
+
+	len = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
+	if (len < 0) {
+		ret = len;
+		goto out;
+	}
+
+	ret = tpm2_commit_space(chip, space, buf, &len);
+out:
 	mutex_unlock(&chip->tpm_mutex);
+	if (ret)
+		return ret;
 
-	return ret;
+	return len;
 }
 
 static void tpm_dev_async_work(struct work_struct *work)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index dcdf2436ae44..cb21880d957c 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -147,21 +147,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
 		return -E2BIG;
 	}
 
-	rc = tpm2_prepare_space(chip, space, buf, bufsiz);
-	/*
-	 * If the command is not implemented by the TPM, synthesize a
-	 * response with a TPM2_RC_COMMAND_CODE return for user-space.
-	 */
-	if (rc == -EOPNOTSUPP) {
-		header->length = cpu_to_be32(sizeof(*header));
-		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
-		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
-						  TSS2_RESMGR_TPM_RC_LAYER);
-		return sizeof(*header);
-	}
-	if (rc)
-		return rc;
-
 	rc = chip->ops->send(chip, buf, count);
 	if (rc < 0) {
 		if (rc != -EPIPE)
@@ -202,12 +187,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
 	if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
 		return -EFAULT;
 
-	rc = tpm2_commit_space(chip, space, buf, &len);
-	if (rc) {
-		dev_err(&chip->dev, "%s: commit error %d\n", __func__, rc);
-		return rc;
-	}
-
 	return len;
 }
 
-- 
2.19.1