Merge tag 'tpmdd-v6.4-rc1-fix-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd

Pull tpm fix from Jarkko Sakkinen:
 "This fixes a critical bug in my first pull request.

  I fixed the cherry pick issue and tested with real hardare and
  libvirt/qemu plus swtpm"

* tag 'tpmdd-v6.4-rc1-fix-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd:
  tpm: Re-enable TPM chip boostrapping non-tpm_tis TPM drivers

3 files changed, 21 insertions, 5 deletions

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 80aaa10f436e..c10a4aa97373 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -605,13 +605,19 @@ static int tpm_get_pcr_allocation(struct tpm_chip *chip)
 }
 
 /*
- * tpm_chip_startup() - performs auto startup and allocates the PCRs
+ * tpm_chip_bootstrap() - Boostrap TPM chip after power on
  * @chip: TPM chip to use.
+ *
+ * Initialize TPM chip after power on. This a one-shot function: subsequent
+ * calls will have no effect.
  */
-int tpm_chip_startup(struct tpm_chip *chip)
+int tpm_chip_bootstrap(struct tpm_chip *chip)
 {
 	int rc;
 
+	if (chip->flags & TPM_CHIP_FLAG_BOOTSTRAPPED)
+		return 0;
+
 	rc = tpm_chip_start(chip);
 	if (rc)
 		return rc;
@@ -624,9 +630,15 @@ int tpm_chip_startup(struct tpm_chip *chip)
 stop:
 	tpm_chip_stop(chip);
 
+	/*
+	 * Unconditionally set, as driver initialization should cease, when the
+	 * boostrapping process fails.
+	 */
+	chip->flags |= TPM_CHIP_FLAG_BOOTSTRAPPED;
+
 	return rc;
 }
-EXPORT_SYMBOL_GPL(tpm_chip_startup);
+EXPORT_SYMBOL_GPL(tpm_chip_bootstrap);
 
 /*
  * tpm_chip_register() - create a character device for the TPM chip
@@ -643,6 +655,10 @@ int tpm_chip_register(struct tpm_chip *chip)
 {
 	int rc;
 
+	rc = tpm_chip_bootstrap(chip);
+	if (rc)
+		return rc;
+
 	tpm_sysfs_add_device(chip);
 
 	tpm_bios_log_setup(chip);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index eaedf569219e..460bb85dd142 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -264,7 +264,7 @@ static inline void tpm_msleep(unsigned int delay_msec)
 		     delay_msec * 1000);
 };
 
-int tpm_chip_startup(struct tpm_chip *chip);
+int tpm_chip_bootstrap(struct tpm_chip *chip);
 int tpm_chip_start(struct tpm_chip *chip);
 void tpm_chip_stop(struct tpm_chip *chip);
 struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip);
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c2421162cf34..02945d53fcef 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1139,7 +1139,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 	init_waitqueue_head(&priv->read_queue);
 	init_waitqueue_head(&priv->int_queue);
 
-	rc = tpm_chip_startup(chip);
+	rc = tpm_chip_bootstrap(chip);
 	if (rc)
 		goto out_err;