tpm: take TPM chip power gating out of tpm_transmit()

Call tpm_chip_start() and tpm_chip_stop() in

* tpm_chip_register()
* tpm_class_shutdown()
* tpm_del_char_device()
* tpm_pm_suspend()
* tpm_try_get_ops() and tpm_put_ops()
* tpm2_del_space()

And remove these calls from tpm_transmit(). The core reason for this
change is that in tpm_vtpm_proxy a locality change requires a virtual
TPM command (a command made up just for that driver).

The consequence of this is that this commit removes the remaining nested
calls.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Alexander Steffen <Alexander.Steffen@infineon.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 038a4767d9d6..744f1b96128e 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -177,13 +177,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
 	memcpy(save, buf, save_size);
 
 	for (;;) {
-		ret = tpm_chip_start(chip, flags);
-		if (ret)
-			return ret;
-
 		ret = tpm_try_transmit(chip, buf, bufsiz, flags);
-
-		tpm_chip_stop(chip, flags);
 		if (ret < 0)
 			break;
 		rc = be32_to_cpu(header->return_code);
@@ -420,10 +414,16 @@ int tpm_pm_suspend(struct device *dev)
 	if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
 		return 0;
 
-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
-		tpm2_shutdown(chip, TPM2_SU_STATE);
-	else
+	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+		mutex_lock(&chip->tpm_mutex);
+		if (!tpm_chip_start(chip, 0)) {
+			tpm2_shutdown(chip, TPM2_SU_STATE);
+			tpm_chip_stop(chip, 0);
+		}
+		mutex_unlock(&chip->tpm_mutex);
+	} else {
 		rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
+	}
 
 	return rc;
 }