Patch "tpm: add sleep only for retry in i2c_nuvoton_write_status()" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

tpm: add sleep only for retry in i2c_nuvoton_write_status()

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
tpm-add-sleep-only-for-retry-in-i2c_nuvoton_write_status.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nayna Jain <[email protected]>
Date: Fri, 10 Mar 2017 13:45:54 -0500
Subject: tpm: add sleep only for retry in i2c_nuvoton_write_status()

From: Nayna Jain <[email protected]>

commit 0afb7118ae021e80ecf70f5a3336e0935505518a upstream.

Currently, there is an unnecessary 1 msec delay added in i2c_nuvoton_write_status() for the successful case. This function is called multiple times during send() and recv(), which implies adding multiple extra delays for every TPM operation.

This patch calls usleep_range() only if retry is to be done.

---
 drivers/char/tpm/tpm_i2c_nuvoton.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -124,8 +124,9 @@ static s32 i2c_nuvoton_write_status(stru
 	/* this causes the current command to be aborted */
 	for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) {
 		status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data);
-		usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
-			     + TPM_I2C_DELAY_RANGE);
+		if (status < 0)
+			usleep_range(TPM_I2C_BUS_DELAY, TPM_I2C_BUS_DELAY
+				     + TPM_I2C_DELAY_RANGE);
 	}
 	return status;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/tpm-msleep-delays-replace-with-usleep_range-in-i2c-nuvoton-driver.patch queue-4.11/tpm-add-sleep-only-for-retry-in-i2c_nuvoton_write_status.patch