From 419a16d9cda3408090704d5e3956c866e18f0af6 Mon Sep 17 00:00:00 2001 From: "Maciej S. Szmigiero" Date: Wed, 25 Jan 2017 22:07:36 +0200 Subject: [PATCH] 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 Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm_tis_core.c | 25 +++++++++++++------------ 1 file 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 */ -- 2.20.1