TPM2_GetCapability with a capability that has the property type value
of TPM_PT_TOTAL_COMMANDS returns a zero length list, when an Infineon
TPM2 is in Field Upgrade mode.
Since an Infineon TPM2.0 in Field Upgrade mode returns RC_SUCCESS on
TPM2_Startup, the Field Upgrade mode has to be detected by
TPM2_GetCapability.
Signed-off-by: Stefan Mahnke-Hartmann <stefan.mahnke-hartmann@xxxxxxxxxxxx>
---
drivers/char/tpm/tpm2-cmd.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index e62a644ce26b..659130e2936e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -746,6 +746,12 @@ int tpm2_auto_startup(struct tpm_chip *chip)
}
rc = tpm2_get_cc_attrs_tbl(chip);
+ /*
+ * Infineon TPM in Field Upgrade mode will return no data for the number
+ * of supported commands.
+ */
+ if (rc == -ENODATA)
+ rc = TPM2_RC_UPGRADE;
out:
if (rc == TPM2_RC_UPGRADE) {
--
2.25.1
