Commit 403d1d03 authored by Stefan Berger's avatar Stefan Berger Committed by James Morris
Browse files

tpm: suppress durations sysfs output if not read



Suppress the output in the 'durations' sysfs entry if they were not read
during driver initialization. This is similar to other sysfs entries
that return nothing if for some reason sending the commands to the TPM
fails.
Signed-off-by: default avatarStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 8ad346c6
......@@ -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]),
......
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