From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Nayna Jain , Jarkko Sakkinen , Sasha Levin Subject: [PATCH AUTOSEL 4.14 26/46] tpm: move the delay_msec increment after sleep in tpm_transmit() Date: Thu, 25 Oct 2018 10:10:33 -0400 Message-Id: <20181025141053.213330-26-sashal@kernel.org> In-Reply-To: <20181025141053.213330-1-sashal@kernel.org> References: <20181025141053.213330-1-sashal@kernel.org> List-ID: From: Nayna Jain [ Upstream commit 92980756979a9c51be0275f395f4e89c42cf199a ] Commit e2fb992d82c6 ("tpm: add retry logic") introduced a new loop to handle the TPM2_RC_RETRY error. The loop retries the command after sleeping for the specified time, which is incremented exponentially in every iteration. Unfortunately, the loop doubles the time before sleeping, causing the initial sleep to be doubled. This patch fixes the initial sleep time. Fixes: commit e2fb992d82c6 ("tpm: add retry logic") Signed-off-by: Nayna Jain Reviewed-by: Mimi Zohar Tested-by: Jarkko Sakkinen Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Sasha Levin --- drivers/char/tpm/tpm-interface.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index a2070ab86c82..89d5915b1a3f 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -611,12 +611,13 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space, rc = be32_to_cpu(header->return_code); if (rc != TPM2_RC_RETRY) break; - delay_msec *= 2; + if (delay_msec > TPM2_DURATION_LONG) { dev_err(&chip->dev, "TPM is in retry loop\n"); break; } tpm_msleep(delay_msec); + delay_msec *= 2; memcpy(buf, save, save_size); } return ret; -- 2.17.1