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| author | Lukasz Majczak <lma@semihalf.com> | 2021-02-16 10:17:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-09 11:09:36 +0100 |
| commit | 6d71cbc911047254ed4bc9ae36f3273cfa3944fd (patch) | |
| tree | beb675eaa639c59e0a97672e34f055fdeeac21ef /drivers/char | |
| parent | c4ca4659678e07f0a14b3b143f6fb746efe11f88 (diff) | |
| download | linux-stable-6d71cbc911047254ed4bc9ae36f3273cfa3944fd.tar.gz linux-stable-6d71cbc911047254ed4bc9ae36f3273cfa3944fd.tar.bz2 linux-stable-6d71cbc911047254ed4bc9ae36f3273cfa3944fd.zip | |
tpm, tpm_tis: Decorate tpm_tis_gen_interrupt() with request_locality()
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 <bigon@debian.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org
Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
Signed-off-by: Lukasz Majczak <lma@semihalf.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm_tis_core.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 46d1fac247db..bcd425d1289c 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -618,12 +618,22 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip) 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 |