[PATCH v2 3/6] tpm: return error code from tpm_gen_interrupt()

From: Jarkko Sakkinen
Date: Sat Jun 25 2016 - 17:45:30 EST


Return error code from tpm_gen_interrupt() and fail tpm_tis family of
drivers on a system error. It doesn't make sense to continue if we
cannot even reach the TPM.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm-interface.c | 6 +++---
drivers/char/tpm/tpm.h | 2 +-
drivers/char/tpm/tpm_tis_core.c | 4 +++-
3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index e953618..4aeacf3 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -466,16 +466,16 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
* Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
* a TPM error code.
*/
-void tpm_gen_interrupt(struct tpm_chip *chip)
+int tpm_gen_interrupt(struct tpm_chip *chip)
{
const char *desc = "attempting to generate an interrupt";
u32 cap2;
cap_t cap;

if (chip->flags & TPM_CHIP_FLAG_TPM2)
- tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
+ return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
else
- tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc);
+ return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc);
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 0f16d18..8153f93 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -483,7 +483,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
const char *desc);
int tpm_get_timeouts(struct tpm_chip *chip);
-void tpm_gen_interrupt(struct tpm_chip *chip);
+int tpm_gen_interrupt(struct tpm_chip *chip);
int tpm_do_selftest(struct tpm_chip *chip);
unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
int tpm_pm_suspend(struct device *dev);
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c7dc58d..79168ca 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -580,7 +580,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
/* Generate an interrupt by having the core call through to
* tpm_tis_send
*/
- tpm_gen_interrupt(chip);
+ rc = tpm_gen_interrupt(chip);
+ if (rc < 0)
+ return rc;

/* tpm_tis_send will either confirm the interrupt is working or it
* will call disable_irq which undoes all of the above.
--
2.7.4