[PATCH v2 3/4] tpm: reduce tpm_msleep() time in get_burstcount()
Nayna Jain <[email protected]>
| Newsgroups | net.sourceforge.lists.tpmdd-devel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-security-module |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> Acked-by: Mimi Zohar <[email protected]> --- 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