Messages in this thread Patch in this message | | | From | Nayna Jain <> | Subject | [PATCH v2 3/4] tpm: reduce tpm_msleep() time in get_burstcount() | Date | Wed, 6 Sep 2017 08:56:38 -0400 |
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Currently, get_burstcount() function sleeps for 5msec in a loop before retrying for next query to burstcount. However, if it takes lesser time for TPM to return, this 5 msec delay is longer than necessary.
This patch replaces the tpm_msleep time from 5msec to 1msec.
After this change, performance on a TPM 1.2 with an 8 byte burstcount for 1000 extends improved from ~10sec to ~9sec.
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com> --- drivers/char/tpm/tpm_tis_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index d1eab29cb447..d710bbc4608b 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -169,7 +169,7 @@ static int get_burstcount(struct tpm_chip *chip) burstcnt = (value >> 8) & 0xFFFF; if (burstcnt) return burstcnt; - tpm_msleep(TPM_TIMEOUT); + tpm_msleep(1); } while (time_before(jiffies, stop)); return -EBUSY; } -- 2.13.3
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