[PATCH 1/3] tpm: Add a missing check for TPM_CHIP_FLAG_HWRNG_DISABLED

[Mario Limonciello]

If the TPM is opted out of hwrng the error handling for
tpm_chip_register() needs to know this so it doesn't try to clean
up an uninitialized chip->hwrng.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/char/tpm/tpm-chip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e904aae9771be..8f61b784810d6 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -629,7 +629,8 @@ int tpm_chip_register(struct tpm_chip *chip)
 	return 0;
 
 out_hwrng:
-	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
+	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip) &&
+	    !(chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED))
 		hwrng_unregister(&chip->hwrng);
 out_ppi:
 	tpm_bios_log_teardown(chip);
-- 
2.34.1