Commit 403d1d03 authored Aug 23, 2011 by Stefan Berger Committed by James Morris Aug 24, 2011

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: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

parent 8ad346c6

drivers/char/tpm/tpm.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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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