1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index caf8012ef47c..e53af7638186 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -963,6 +963,9 @@ ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 {
         struct tpm_chip *chip = dev_get_drvdata(dev);
 
+        if (chip->vendor.duration[TPM_LONG] == 0)
+                return 0;
+
         return sprintf(buf, "%d %d %d [%s]\n",
                        jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
                        jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),