From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Tomas Winkler <tomas.winkler@intel.com>,
Tadeusz Struk <tadeusz.struk@intel.com>,
Stefan Berger <stefanb@linux.vnet.ibm.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Peter Huewe <peterhuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 3/8] tpm: clean up tpm_try_transmit() error handling flow
Date: Sat, 3 Nov 2018 19:08:00 +0200 [thread overview]
Message-ID: <20181103170806.12177-4-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20181103170806.12177-1-jarkko.sakkinen@linux.intel.com>
Move locking, locality handling and power management to tpm_transmit()
in order to simplify the flow and fix the error message formatting in
tpm_try_transmit() to output correct function name by using the
'__func__' macro.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
drivers/char/tpm/tpm-interface.c | 99 ++++++++++++++------------------
1 file changed, 44 insertions(+), 55 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 64510ed81b46..a5d6e9dd2998 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -171,7 +171,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
ssize_t len = 0;
u32 count, ordinal;
unsigned long stop;
- bool need_locality;
rc = tpm_validate_command(chip, space, buf, bufsiz);
if (rc == -EINVAL)
@@ -201,37 +200,16 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
return -E2BIG;
}
- if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED))
- mutex_lock(&chip->tpm_mutex);
-
- if (chip->ops->clk_enable != NULL)
- chip->ops->clk_enable(chip, true);
-
- /* Store the decision as chip->locality will be changed. */
- need_locality = chip->locality == -1;
-
- if (need_locality) {
- rc = tpm_request_locality(chip, flags);
- if (rc < 0) {
- need_locality = false;
- goto out_locality;
- }
- }
-
- rc = tpm_cmd_ready(chip, flags);
- if (rc)
- goto out_locality;
-
rc = tpm2_prepare_space(chip, space, ordinal, buf);
if (rc)
- goto out;
+ return rc;
rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
if (rc != -EPIPE)
dev_err(&chip->dev,
"%s: tpm_send: error %d\n", __func__, rc);
- goto out;
+ return rc;
}
if (chip->flags & TPM_CHIP_FLAG_IRQ)
@@ -246,8 +224,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
if (chip->ops->req_canceled(chip, status)) {
dev_err(&chip->dev, "Operation Canceled\n");
- rc = -ECANCELED;
- goto out;
+ return -ECANCELED;
}
tpm_msleep(TPM_TIMEOUT_POLL);
@@ -256,44 +233,22 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
chip->ops->cancel(chip);
dev_err(&chip->dev, "Operation Timed out\n");
- rc = -ETIME;
- goto out;
+ return -ETIME;
out_recv:
len = chip->ops->recv(chip, buf, bufsiz);
if (len < 0) {
- rc = len;
- dev_err(&chip->dev,
- "tpm_transmit: tpm_recv: error %d\n", rc);
- goto out;
- } else if (len < TPM_HEADER_SIZE) {
- rc = -EFAULT;
- goto out;
- }
-
- if (len != be32_to_cpu(header->length)) {
- rc = -EFAULT;
- goto out;
+ dev_err(&chip->dev, "%s: recv error %d\n", __func__, len);
+ return len;
}
+ if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
+ return -EFAULT;
rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
if (rc)
- dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
-
-out:
- /* may fail but do not override previous error value in rc */
- tpm_go_idle(chip, flags);
-
-out_locality:
- if (need_locality)
- tpm_relinquish_locality(chip, flags);
-
- if (chip->ops->clk_enable != NULL)
- chip->ops->clk_enable(chip, false);
+ return rc;
- if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED))
- mutex_unlock(&chip->tpm_mutex);
- return rc ? rc : len;
+ return len;
}
/**
@@ -322,6 +277,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
/* space for header and handles */
u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
unsigned int delay_msec = TPM2_DURATION_SHORT;
+ bool has_locality = false;
u32 rc = 0;
ssize_t ret;
const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE,
@@ -337,7 +293,40 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
memcpy(save, buf, save_size);
for (;;) {
+ if (!(flags & TPM_TRANSMIT_UNLOCKED) &&
+ !(flags & TPM_TRANSMIT_NESTED))
+ mutex_lock(&chip->tpm_mutex);
+
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
+ if (chip->locality == -1) {
+ ret = tpm_request_locality(chip, flags);
+ if (ret)
+ goto out_locality;
+ has_locality = true;
+ }
+
+ ret = tpm_cmd_ready(chip, flags);
+ if (ret)
+ goto out_locality;
+
ret = tpm_try_transmit(chip, space, buf, bufsiz, flags);
+
+ /* This may fail but do not override ret. */
+ tpm_go_idle(chip, flags);
+
+out_locality:
+ if (has_locality)
+ tpm_relinquish_locality(chip, flags);
+
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ if (!(flags & TPM_TRANSMIT_UNLOCKED) &&
+ !(flags & TPM_TRANSMIT_NESTED))
+ mutex_unlock(&chip->tpm_mutex);
+
if (ret < 0)
break;
rc = be32_to_cpu(header->return_code);
--
2.19.1
next prev parent reply other threads:[~2018-11-03 17:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-03 17:07 [PATCH 0/8] Detach TPM space code out of the tpm_transmit() flow Jarkko Sakkinen
2018-11-03 17:07 ` [PATCH 1/8] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2018-11-03 17:07 ` [PATCH 2/8] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2018-11-03 17:08 ` Jarkko Sakkinen [this message]
2018-11-03 17:08 ` [PATCH 4/8] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2018-11-03 17:08 ` [PATCH 5/8] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2018-11-03 17:08 ` [PATCH 6/8] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2018-11-03 17:08 ` [PATCH 7/8] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2018-11-03 17:08 ` [PATCH 8/8] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2018-11-04 7:46 ` [PATCH 0/8] Detach TPM space code out of the tpm_transmit() flow Winkler, Tomas
2018-11-04 16:25 ` Jarkko Sakkinen
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