Re: [PATCH] tpm: moves the delay_msec increment after sleep in tpm_transmit()

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On 04/05/2018 03:42 PM, Jarkko Sakkinen wrote:
On Mon, Apr 02, 2018 at 09:50:06PM +0530, Nayna Jain wrote:
Commit e2fb992d82c6 ("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. This patch fixes the initial sleep to be the default
sleep time.
I think I understand the code change but do not understand what the
long description.

It tells that the first sleep is delay_msec * 2 and not delay_msec.


Fixes: commit e2fb992d82c6 ("tpm: add retry logic")
Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx>
---
  drivers/char/tpm/tpm-interface.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index c43a9e28995e..6201aab374e6 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -587,7 +587,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
  		 */
  		if (rc == TPM2_RC_TESTING && cc == TPM2_CC_SELF_TEST)
  			break;
-		delay_msec *= 2;
+
Extra whitespace

I left just for clarity, but if not needed then I can remove it.

Thanks & Regards,
   - Nayna


  		if (delay_msec > TPM2_DURATION_LONG) {
  			if (rc == TPM2_RC_RETRY)
  				dev_err(&chip->dev, "in retry loop\n");
@@ -597,6 +597,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
  			break;
  		}
  		tpm_msleep(delay_msec);
+		delay_msec *= 2;
  		memcpy(buf, save, save_size);
  	}
  	return ret;
--
2.13.6

/Jarkko





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