From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
From: Lukasz Majczak <l...@semihalf.com>
commit d53a6adfb553969809eb2b736a976ebb5146cd95 upstream.
This is shown with Samsung Chromebook Pro (Caroline) with TPM 1.2
(SLB 9670):
[ 4.324298] TPM returned invalid status
[ 4.324806] WARNING: CPU: 2 PID: 1 at drivers/char/tpm/tpm_tis_core.c:275
tpm_tis_status+0x86/0x8f
Background
==========
TCG PC Client Platform TPM Profile (PTP) Specification, paragraph 6.1 FIFO
Interface Locality Usage per Register, Table 39 Register Behavior Based on
Locality Setting for FIFO - a read attempt to TPM_STS_x Registers returns
0xFF in case of lack of locality.
The fix
=======
Decorate tpm_tis_gen_interrupt() with request_locality() and
release_locality().
Cc: Laurent Bigonville <bi...@debian.org>
Cc: James Bottomley <james.bottom...@hansenpartnership.com>
Cc: Guenter Roeck <li...@roeck-us.net>
Cc: sta...@vger.kernel.org
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Signed-off-by: Lukasz Majczak <l...@semihalf.com>
Signed-off-by: Jarkko Sakkinen <jar...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/char/tpm/tpm_tis_core.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -707,12 +707,22 @@ static int tpm_tis_gen_interrupt(struct
const char *desc = "attempting to generate an interrupt";
u32 cap2;
cap_t cap;
+ int ret;
+ /* TPM 2.0 */
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
- else
- return tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
- 0);
+
+ /* TPM 1.2 */
+ ret = request_locality(chip, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
+
+ release_locality(chip, 0);
+
+ return ret;
}
/* Register the IRQ and issue a command that will cause an interrupt. If an
