[PATCH] tpm: allow TCPA log area to be empty

[Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>]

TCPA log are can be empty when the TPM is disabled. This commit changes the
behavior of tpm_read_log_acpi() to return successfully in this case.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 55a82ab3181b ("[PATCH] tpm: add bios measurement log")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
 drivers/char/tpm/tpm_eventlog_acpi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_eventlog_acpi.c b/drivers/char/tpm/tpm_eventlog_acpi.c
index 66f19e93c216..f5f66dcd6f30 100644
--- a/drivers/char/tpm/tpm_eventlog_acpi.c
+++ b/drivers/char/tpm/tpm_eventlog_acpi.c
@@ -84,8 +84,8 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
 		break;
 	}
 	if (!len) {
-		dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
-		return -EIO;
+		dev_info(&chip->dev, "TCPA log area is empty\n");
+		return 0;
 	}
 
 	/* malloc EventLog space */
-- 
2.15.1