linux-kernel - [PATCH] tpm: sleep at least <...> ms in tpm

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Message-ID: <20220510112902.23213-1-johannes.holland@infineon.com>
Date:   Tue, 10 May 2022 13:29:03 +0200
From:   Johannes Holland <johannes.holland@...ineon.com>
To:     <jarkko@...nel.org>, <linux-integrity@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <peterhuewe@....de>, <jgg@...pe.ca>,
        Johannes Holland <johannes.holland@...ineon.com>
Subject: [PATCH] tpm: sleep at least <...> ms in tpm_msleep()

To comply with protocol requirements, minimum polling times must often
be adhered to. Therefore, a macro like tpm_msleep() should sleep at
least the given amount of time (not up to the given period). Have
tpm_msleep() sleep at least the given number of milliseconds.

Signed-off-by: Johannes Holland <johannes.holland@...ineon.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 2163c6ee0d36..0971b55fffe3 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -185,8 +185,8 @@ int tpm_pm_resume(struct device *dev);
 
 static inline void tpm_msleep(unsigned int delay_msec)
 {
-	usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
-		     delay_msec * 1000);
+	usleep_range(delay_msec * 1000, (delay_msec * 1000)
+		     + TPM_TIMEOUT_RANGE_US);
 };
 
 int tpm_chip_start(struct tpm_chip *chip);
-- 
2.34.1