On Wed, Sep 06, 2017 at 08:56:39AM -0400, Nayna Jain wrote:
> 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 <na...@linux.vnet.ibm.com>
> Acked-by: Mimi Zohar <zo...@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
>
Doesn't this need a Fixes tag?
/Jarkko
