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SubjectRe: [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@linux.vnet.ibm.com>
>> Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
>> ---
>> 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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