Messages in this thread Patch in this message | | | From | Nayna Jain <> | Subject | [PATCH v2 4/4] tpm: use tpm_msleep() value as max delay | Date | Wed, 6 Sep 2017 08:56:39 -0400 |
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Currently, tpm_msleep() uses delay_msec as the minimum value in usleep_range. However, that is the maximum time we want to wait. The function is modified to use the delay_msec as the maximum value, not the minimum value.
After this change, performance on a TPM 1.2 with an 8 byte burstcount for 1000 extends improved from ~9sec to ~8sec.
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com> --- drivers/char/tpm/tpm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index eb2f8818eded..ff5a8b7b80b9 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -533,8 +533,8 @@ int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, static inline void tpm_msleep(unsigned int delay_msec) { - usleep_range(delay_msec * 1000, - (delay_msec * 1000) + TPM_TIMEOUT_RANGE_US); + usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US, + delay_msec * 1000); }; struct tpm_chip *tpm_chip_find_get(int chip_num); -- 2.13.3
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