38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From 86d94390d9b97639fecb3e032120b93004a3036d Mon Sep 17 00:00:00 2001
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From: Nayna Jain <nayna@linux.vnet.ibm.com>
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Date: Fri, 10 Nov 2017 16:42:19 -0500
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Subject: [PATCH] tpm: use tpm_msleep() value as max delay
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Currently, tpm_msleep() uses delay_msec as the minimum value in
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usleep_range. However, that is the maximum time we want to wait.
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The function is modified to use the delay_msec as the maximum
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value, not the minimum value.
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After this change, performance on a TPM 1.2 with an 8 byte
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burstcount for 1000 extends improved from ~9sec to ~8sec.
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Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
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Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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---
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tpm.h | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/tpm.h b/tpm.h
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index d9c3659..6f3297e 100644
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--- a/tpm.h
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+++ b/tpm.h
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@@ -550,8 +550,8 @@ int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
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static inline void tpm_msleep(unsigned int delay_msec)
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{
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- usleep_range(delay_msec * 1000,
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- (delay_msec * 1000) + TPM_TIMEOUT_RANGE_US);
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+ usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
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+ delay_msec * 1000);
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};
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struct tpm_chip *tpm_chip_find_get(int chip_num);
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--
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1.8.3.1
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