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Date: Tue, 12 Sep 2017 17:47:03 -0700 From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> To: Nayna Jain <nayna@...ux.vnet.ibm.com> Cc: tpmdd-devel@...ts.sourceforge.net, peterhuewe@....de, tpmdd@...horst.net, jgunthorpe@...idianresearch.com, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ima-devel@...ts.sourceforge.net, patrickc@...ibm.com Subject: Re: [PATCH v2 4/4] tpm: use tpm_msleep() value as max delay 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 <nayna@...ux.vnet.ibm.com> > Acked-by: Mimi Zohar <zohar@...ux.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
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