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tpm: remove TPM_TRANSMIT_UNLOCKED flag

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Added locking as part of tpm_try_get_ops() and tpm_put_ops() as they are
anyway used in most of the call sites except in tpmrm_release() where we
take the locks manually.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Alexander Steffen <Alexander.Steffen@infineon.com>
This commit is contained in:
Jarkko Sakkinen 2018-11-04 20:01:42 +02:00
parent 2677ca98ae
commit 2f257402ee
6 changed files with 17 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/char/tpm/tpm-chip.c
View File

@ -58,6 +58,7 @@ int tpm_try_get_ops(struct tpm_chip *chip)
if (!chip->ops)
goto out_lock;
mutex_lock(&chip->tpm_mutex);
return 0;
out_lock:
up_read(&chip->ops_sem);
@ -75,6 +76,7 @@ EXPORT_SYMBOL_GPL(tpm_try_get_ops);
*/
void tpm_put_ops(struct tpm_chip *chip)
{
mutex_unlock(&chip->tpm_mutex);
up_read(&chip->ops_sem);
put_device(&chip->dev);
}

9
drivers/char/tpm/tpm-dev-common.c
View File

@ -33,7 +33,6 @@ static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
struct tpm_header *header = (void *)buf;
ssize_t ret, len;
mutex_lock(&chip->tpm_mutex);
ret = tpm2_prepare_space(chip, space, buf, bufsiz);
/* If the command is not implemented by the TPM, synthesize a
* response with a TPM2_RC_COMMAND_CODE return for user-space.
@ -46,18 +45,16 @@ static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
ret = sizeof(*header);
}
if (ret)
goto out_lock;
goto out_rc;
len = tpm_transmit(chip, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
len = tpm_transmit(chip, buf, bufsiz, 0);
if (len < 0)
ret = len;
if (!ret)
ret = tpm2_commit_space(chip, space, buf, &len);
out_lock:
mutex_unlock(&chip->tpm_mutex);
out_rc:
return ret ? ret : len;
}

8
drivers/char/tpm/tpm-interface.c
View File

@ -236,10 +236,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
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);
@ -266,10 +262,6 @@ out_locality:
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);

8
drivers/char/tpm/tpm.h
View File

@ -488,14 +488,10 @@ extern struct idr dev_nums_idr;
/**
* enum tpm_transmit_flags - flags for tpm_transmit()
*
* @TPM_TRANSMIT_UNLOCKED: do not lock the chip
* @TPM_TRANSMIT_NESTED: discard setup steps (power management,
* locality) including locking (i.e. implicit
* UNLOCKED)
* %TPM_TRANSMIT_NESTED: discard setup steps (power management, locality)
*/
enum tpm_transmit_flags {
TPM_TRANSMIT_UNLOCKED = BIT(0),
TPM_TRANSMIT_NESTED = BIT(1),
TPM_TRANSMIT_NESTED = BIT(0),
};
ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,

13
drivers/char/tpm/tpm2-cmd.c
View File

@ -652,17 +652,12 @@ int tpm2_unseal_trusted(struct tpm_chip *chip,
u32 blob_handle;
int rc;
mutex_lock(&chip->tpm_mutex);
rc = tpm2_load_cmd(chip, payload, options, &blob_handle,
TPM_TRANSMIT_UNLOCKED);
rc = tpm2_load_cmd(chip, payload, options, &blob_handle, 0);
if (rc)
goto out;
return rc;
rc = tpm2_unseal_cmd(chip, payload, options, blob_handle,
TPM_TRANSMIT_UNLOCKED);
tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED);
out:
mutex_unlock(&chip->tpm_mutex);
rc = tpm2_unseal_cmd(chip, payload, options, blob_handle, 0);
tpm2_flush_context_cmd(chip, blob_handle, 0);
return rc;
}

15
drivers/char/tpm/tpm2-space.c
View File

@ -38,8 +38,7 @@ static void tpm2_flush_sessions(struct tpm_chip *chip, struct tpm_space *space)
for (i = 0; i < ARRAY_SIZE(space->session_tbl); i++) {
if (space->session_tbl[i])
tpm2_flush_context_cmd(chip, space->session_tbl[i],
TPM_TRANSMIT_UNLOCKED);
tpm2_flush_context_cmd(chip, space->session_tbl[i], 0);
}
}
@ -83,7 +82,7 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf,
body_size = sizeof(*ctx) + be16_to_cpu(ctx->blob_size);
tpm_buf_append(&tbuf, &buf[*offset], body_size);
rc = tpm_transmit_cmd(chip, &tbuf, 4, TPM_TRANSMIT_UNLOCKED, NULL);
rc = tpm_transmit_cmd(chip, &tbuf, 4, 0, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
@ -131,7 +130,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf,
tpm_buf_append_u32(&tbuf, handle);
rc = tpm_transmit_cmd(chip, &tbuf, 0, TPM_TRANSMIT_UNLOCKED, NULL);
rc = tpm_transmit_cmd(chip, &tbuf, 0, 0, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
@ -167,8 +166,7 @@ void tpm2_flush_space(struct tpm_chip *chip)
for (i = 0; i < ARRAY_SIZE(space->context_tbl); i++)
if (space->context_tbl[i] && ~space->context_tbl[i])
tpm2_flush_context_cmd(chip, space->context_tbl[i],
TPM_TRANSMIT_UNLOCKED);
tpm2_flush_context_cmd(chip, space->context_tbl[i], 0);
tpm2_flush_sessions(chip, space);
}
@ -416,7 +414,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp,
return 0;
out_no_slots:
tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_UNLOCKED);
tpm2_flush_context_cmd(chip, phandle, 0);
dev_warn(&chip->dev, "%s: out of slots for 0x%08X\n", __func__,
phandle);
return -ENOMEM;
@ -503,8 +501,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
} else if (rc)
return rc;
tpm2_flush_context_cmd(chip, space->context_tbl[i],
TPM_TRANSMIT_UNLOCKED);
tpm2_flush_context_cmd(chip, space->context_tbl[i], 0);
space->context_tbl[i] = ~0;
}