[PATCH v4 3/5] tpm: replace tpm_gen_interrupt() with tpm_tis_gen_interrupt()

From: Jarkko Sakkinen
Date: Tue Jul 19 2016 - 19:45:58 EST


Since tpm_gen_interrupt() is only used in tpm_tis_core.c this commit
replaces it with an internal tpm_tis_gen_interrupt(). The semantics
also changed in a way that on a system error the driver initialization
is failed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm-interface.c | 15 ---------------
drivers/char/tpm/tpm.h | 2 --
drivers/char/tpm/tpm2-cmd.c | 17 -----------------
drivers/char/tpm/tpm_tis_core.c | 19 +++++++++++++++----
4 files changed, 15 insertions(+), 38 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 1abe2d7..f43cc3f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -459,21 +459,6 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
return rc;
}

-void tpm_gen_interrupt(struct tpm_chip *chip)
-{
- struct tpm_cmd_t tpm_cmd;
- ssize_t rc;
-
- tpm_cmd.header.in = tpm_getcap_header;
- tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
- tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
- tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-
- rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the timeouts");
-}
-EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
-
#define TPM_ORD_STARTUP cpu_to_be32(153)
#define TPM_ST_CLEAR cpu_to_be16(1)
#define TPM_ST_STATE cpu_to_be16(2)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 8b864dd..6e002c4 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -483,7 +483,6 @@ 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 tpm1_auto_startup(struct tpm_chip *chip);
int tpm_do_selftest(struct tpm_chip *chip);
unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
@@ -530,6 +529,5 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
int tpm2_auto_startup(struct tpm_chip *chip);
void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
-int tpm2_gen_interrupt(struct tpm_chip *chip);
int tpm2_probe(struct tpm_chip *chip);
#endif
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 08c7e23..1c393ba 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -895,23 +895,6 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
}

/**
- * tpm2_gen_interrupt() - generate an interrupt
- * @chip: TPM chip to use
- *
- * 0 is returned when the operation is successful. If a negative number is
- * returned it remarks a POSIX error code. If a positive number is returned
- * it remarks a TPM error.
- */
-int tpm2_gen_interrupt(struct tpm_chip *chip)
-{
- u32 dummy;
-
- return tpm2_get_tpm_pt(chip, 0x100, &dummy,
- "attempting to generate an interrupt");
-}
-EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
-
-/**
* tpm2_probe() - probe TPM 2.0
* @chip: TPM chip to use
*
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index d66f51b..f22caf8 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -526,6 +526,18 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
return IRQ_HANDLED;
}

+static int tpm_tis_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)
+ return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
+ else
+ return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc);
+}
+
/* Register the IRQ and issue a command that will cause an interrupt. If an
* irq is seen then leave the chip setup for IRQ operation, otherwise reverse
* everything and leave in polling mode. Returns 0 on success.
@@ -575,10 +587,9 @@ 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
*/
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- tpm2_gen_interrupt(chip);
- else
- tpm_gen_interrupt(chip);
+ rc = tpm_tis_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