diff options
| author | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2015-01-29 05:43:47 (GMT) |
|---|---|---|
| committer | Peter Huewe <peterhuewe@gmx.de> | 2015-02-15 15:56:49 (GMT) |
| commit | 74d6b3ceaa17d111220c3f09f50f901bf955d7c8 (patch) | |
| tree | 8460d16593728245a56f8f270b4f107df0dba020 /drivers/char/tpm/tpm.h | |
| parent | 04f81f0154e4bf002be6f4d85668ce1257efa4d9 (diff) | |
| download | linux-74d6b3ceaa17d111220c3f09f50f901bf955d7c8.tar.xz | |
tpm: fix suspend/resume paths for TPM 2.0
Fixed suspend/resume paths for TPM 2.0 and consolidated all the
associated code to the tpm_pm_suspend() and tpm_pm_resume()
functions. Resume path should be handled by the firmware, i.e.
Startup(CLEAR) for hibernate and Startup(STATE) for suspend.
There might be some non-PC embedded devices in the future where
Startup() is not the handled by the FW but fixing the code for
those IMHO should be postponed until there is hardware available
to test the fixes although extra Startup in the driver code is
essentially a NOP.
Added Shutdown(CLEAR) to the remove paths of TIS and CRB drivers.
Changed tpm2_shutdown() to a void function because there isn't
much you can do except print an error message if this fails with
a system error.
Fixes: aec04cbdf723 ("tpm: TPM 2.0 FIFO Interface")
Fixes: 30fc8d138e91 ("tpm: TPM 2.0 CRB Interface")
[phuewe: both did send TPM_Shutdown on resume which 'disables' the TPM
and did not send TPM2_Shutdown on teardown which leads some TPM2.0 to
believe there was an attack (no TPM2_Shutdown = no orderly shutdown =
attack)]
Reported-by: Peter Hüwe <PeterHuewe@gmx.de>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Scot Doyle <lkml14@scotdoyle.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Diffstat (limited to 'drivers/char/tpm/tpm.h')
| -rw-r--r-- | drivers/char/tpm/tpm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 7b0727c..a2ce379 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -432,7 +432,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, const char *desc); extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type); -extern int tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type); +extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type); extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32); extern int tpm2_do_selftest(struct tpm_chip *chip); extern int tpm2_gen_interrupt(struct tpm_chip *chip, bool quiet); |