diff options
Diffstat (limited to 'drivers/char/tpm/tpm_tis_core.c')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 65ab1b027949..92c51c6cfd1b 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -239,6 +239,17 @@ static u8 tpm_tis_status(struct tpm_chip *chip) if (rc < 0) return 0; + if (unlikely((status & TPM_STS_READ_ZERO) != 0)) { + /* + * If this trips, the chances are the read is + * returning 0xff because the locality hasn't been + * acquired. Usually because tpm_try_get_ops() hasn't + * been called before doing a TPM operation. + */ + WARN_ONCE(1, "TPM returned invalid status\n"); + return 0; + } + return status; } |