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tpm: move the delay_msec increment after sleep in tpm_transmit()

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[ Upstream commit 9298075697 ]

Commit e2fb992d82 ("tpm: add retry logic") introduced a new loop to
handle the TPM2_RC_RETRY error. The loop retries the command after
sleeping for the specified time, which is incremented exponentially in
every iteration.

Unfortunately, the loop doubles the time before sleeping, causing the
initial sleep to be doubled. This patch fixes the initial sleep time.

Fixes: commit e2fb992d82 ("tpm: add retry logic")
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nayna Jain 2018-04-02 21:50:06 +05:30 committed by Greg Kroah-Hartman
parent c1fdafea62
commit db9d15988a
1 changed files with 2 additions and 1 deletions
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3
drivers/char/tpm/tpm-interface.c
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@ -611,12 +611,13 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
rc = be32_to_cpu(header->return_code);
if (rc != TPM2_RC_RETRY)
break;
delay_msec *= 2;
if (delay_msec > TPM2_DURATION_LONG) {
dev_err(&chip->dev, "TPM is in retry loop\n");
break;
}
tpm_msleep(delay_msec);
delay_msec *= 2;
memcpy(buf, save, save_size);
}
return ret;