Re: [PATCH v4 20/21] tpm1: reimplement tpm1_continue_selftest() using tpm_buf

[Nayna Jain]

On 09/21/2018 07:28 PM, Tomas Winkler wrote:

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.wink...@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakki...@linux.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,

I think this needs to buf.data instead of &buf.data

Thanks & Regards,
     - Nayna

                              0, 0, "continue selftest");
+
+       tpm_buf_destroy(&buf);
+
        return rc;
  }