tpm: use tpm_pcr_read_dev() in tpm_do_selftest()

Instead of a ad-hoc protocol message construction it is better to
call tpm_pcr_read_dev().

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 6bffb13..3edf2e8 100644 (file)
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -782,7 +782,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
        unsigned int loops;
        unsigned int delay_msec = 100;
        unsigned long duration;
-       struct tpm_cmd_t cmd;
+       u8 dummy[TPM_DIGEST_SIZE];
 
        duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
 
@@ -797,9 +797,8 @@ int tpm_do_selftest(struct tpm_chip *chip)
 
        do {
                /* Attempt to read a PCR value */
-               cmd.header.in = pcrread_header;
-               cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
-               rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE, 0);
+               rc = tpm_pcr_read_dev(chip, 0, dummy);
+
                /* Some buggy TPMs will not respond to tpm_tis_ready() for
                 * around 300ms while the self test is ongoing, keep trying
                 * until the self test duration expires. */
@@ -814,7 +813,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
                if (rc < TPM_HEADER_SIZE)
                        return -EFAULT;
 
-               rc = be32_to_cpu(cmd.header.out.return_code);
                if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
                        dev_info(&chip->dev,
                                 "TPM is disabled/deactivated (0x%X)\n", rc);