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-rw-r--r--drivers/char/tpm/tpm_tis_core.c25
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 */