Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-01-01 15:51:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

tpm: add sleep only for retry in i2c_nuvoton_write_status()

Browse Source 
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.

Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org (linux-4.8)
Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Nayna Jain 2017-03-10 13:45:54 -05:00 committed by Jarkko Sakkinen
parent 2d2e376f05
commit 0afb7118ae
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/char/tpm/tpm_i2c_nuvoton.c
View File

@ -124,8 +124,9 @@ static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data)
/* 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;
}