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| author |   Maciej S. Szmigiero <mail@maciej.szmigiero.name> | 2017-01-25 22:07:36 +0200 |
|---|---|---|
| committer |   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-02-03 22:03:14 +0200 |
| commit | 419a16d9cda3408090704d5e3956c866e18f0af6 (patch) | |
| tree | 6ec81ea4b310fc1d58379cf5eae760d4b4d1f547 /drivers/char | |
| parent | tpm: Begin the process to deprecate user_read_timer (diff) | |
| download | linux-dev-419a16d9cda3408090704d5e3956c866e18f0af6.tar.xz linux-dev-419a16d9cda3408090704d5e3956c866e18f0af6.zip | |
tpm_tis: fix iTPM probe via probe_itpm() function
probe_itpm() function is supposed to send command without an itpm flag set
and if this fails to repeat it, this time with the itpm flag set.
However, commit 41a5e1cf1fe15 ("tpm/tpm_tis: Split tpm_tis driver into a
core and TCG TIS compliant phy") moved the itpm flag from an "itpm"
variable to a TPM_TIS_ITPM_POSSIBLE chip flag, so setting the
(now function-local) itpm variable no longer had any effect.
Finally, this function-local itpm variable was removed by
commit 56af322156dbe9 ("tpm/tpm_tis: remove unused itpm variable")
Tested only on non-iTPM TIS TPM.
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 45f8840ee678..c0f296b5d413 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -464,6 +464,9 @@ static int probe_itpm(struct tpm_chip *chip) size_t len = sizeof(cmd_getticks); u16 vendor; + if (priv->flags & TPM_TIS_ITPM_WORKAROUND) + return 0; + rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor); if (rc < 0) return rc; @@ -479,12 +482,15 @@ static int probe_itpm(struct tpm_chip *chip) tpm_tis_ready(chip); release_locality(chip, priv->locality, 0); + priv->flags |= TPM_TIS_ITPM_WORKAROUND; + rc = tpm_tis_send_data(chip, cmd_getticks, len); - if (rc == 0) { + if (rc == 0) dev_info(&chip->dev, "Detected an iTPM.\n"); - rc = 1; - } else + else { + priv->flags &= ~TPM_TIS_ITPM_WORKAROUND; rc = -EFAULT; + } out: tpm_tis_ready(chip); @@ -741,15 +747,10 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2", vendor >> 16, rid); - if (!(priv->flags & TPM_TIS_ITPM_WORKAROUND)) { - probe = probe_itpm(chip); - if (probe < 0) { - rc = -ENODEV; - goto out_err; - } - - if (!!probe) - priv->flags |= TPM_TIS_ITPM_WORKAROUND; + probe = probe_itpm(chip); + if (probe < 0) { + rc = -ENODEV; + goto out_err; } /* Figure out the capabilities */ |