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>,
Nayna Jain <nayna@linux.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 v7 09/17] tpm: clean up tpm_try_transmit() error handling flow
Date: Tue, 13 Nov 2018 20:36:08 +0200 [thread overview]
Message-ID: <20181113183620.27447-10-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20181113183620.27447-1-jarkko.sakkinen@linux.intel.com>
Move locking, locality handling and power management to tpm_transmit()
in order to simplify the flow.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
drivers/char/tpm/tpm-interface.c | 71 ++++++++++++++++----------------
1 file changed, 35 insertions(+), 36 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index ef00b698ec02..f2280bf15339 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)
@@ -201,30 +200,9 @@ 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_idle;
+ return rc;
rc = chip->ops->send(chip, buf, count);
if (rc < 0) {
@@ -273,19 +251,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
else
rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
-out_idle:
- /* 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);
-
- if (!(flags & TPM_TRANSMIT_UNLOCKED) && !(flags & TPM_TRANSMIT_NESTED))
- mutex_unlock(&chip->tpm_mutex);
return rc ? rc : len;
}
@@ -315,6 +280,7 @@ 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,
@@ -330,7 +296,40 @@ 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:[~2018-11-13 18:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-13 18:35 [PATCH v7 00/17] Removed nested TPM operations Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 01/17] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 02/17] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 03/17] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 04/17] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 05/17] tpm: declare struct tpm_header Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 06/17] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 07/17] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 08/17] tpm: call tpm2_flush_space() on error in tpm_try_transmit() Jarkko Sakkinen
2018-11-13 18:36 ` Jarkko Sakkinen [this message]
2018-11-13 18:36 ` [PATCH v7 10/17] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 11/17] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 12/17] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c Jarkko Sakkinen
2018-11-13 18:36 ` [PATCH v7 14/17] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2018-11-13 20:39 ` Stefan Berger
2018-11-13 18:36 ` [PATCH v7 15/17] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2018-11-13 21:17 ` Stefan Berger
2018-11-13 22:34 ` Stefan Berger
2018-11-14 1:56 ` Stefan Berger
2018-11-16 12:32 ` Jarkko Sakkinen
2018-11-15 20:26 ` Jarkko Sakkinen
2018-11-13 23:02 ` Stefan Berger
2018-11-14 1:47 ` Stefan Berger
2018-11-13 18:36 ` [PATCH v7 16/17] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2018-11-13 21:26 ` Stefan Berger
2018-11-13 18:36 ` [PATCH v7 17/17] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
2018-11-13 21:28 ` Stefan Berger
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