linux-kernel - [PATCH v4 20/21] tpm1: reimplement tpm1_continue_selftest() using tpm

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Message-Id: <20180921135820.20549-21-tomas.winkler@intel.com>
Date:   Fri, 21 Sep 2018 16:58:19 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [PATCH v4 20/21] tpm1: reimplement tpm1_continue_selftest() using tpm_buf

Reimplement tpm1_continue_selftest() using tpm_buf structure.
This is the last command using the old tpm_cmd_t structure
and now the structure can be removed.

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
V3: New in the series.
V4: Resend.

 drivers/char/tpm/tpm.h      |  9 ---------
 drivers/char/tpm/tpm1-cmd.c | 21 ++++++++++-----------
 2 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 2f06740f993d..7ada00f067f1 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -377,15 +377,6 @@ enum tpm_sub_capabilities {
 	TPM_CAP_PROP_TIS_DURATION = 0x120,
 };
 
-typedef union {
-	struct	tpm_input_header in;
-	struct	tpm_output_header out;
-} tpm_cmd_header;
-
-struct tpm_cmd_t {
-	tpm_cmd_header	header;
-} __packed;
-
 
 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
  * bytes, but 128 is still a relatively large number of random bytes and
diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index cde9a01ad31f..6d7d70b0d130 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -604,15 +604,8 @@ int tpm1_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 }
 
 #define TPM_ORD_CONTINUE_SELFTEST 83
-#define CONTINUE_SELFTEST_RESULT_SIZE 10
-static const struct tpm_input_header continue_selftest_header = {
-	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
-	.length = cpu_to_be32(10),
-	.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
-};
-
 /**
- * tpm_continue_selftest -- run TPM's selftest
+ * tpm_continue_selftest() - run TPM's selftest
  * @chip: TPM chip to use
  *
  * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
@@ -620,12 +613,18 @@ static const struct tpm_input_header continue_selftest_header = {
  */
 static int tpm1_continue_selftest(struct tpm_chip *chip)
 {
+	struct tpm_buf buf;
 	int rc;
-	struct tpm_cmd_t cmd;
 
-	cmd.header.in = continue_selftest_header;
-	rc = tpm_transmit_cmd(chip, NULL, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_CONTINUE_SELFTEST);
+	if (rc)
+		return rc;
+
+	rc = tpm_transmit_cmd(chip, NULL, &buf.data, PAGE_SIZE,
 			      0, 0, "continue selftest");
+
+	tpm_buf_destroy(&buf);
+
 	return rc;
 }
 
-- 
2.14.4