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TPM: Long default timeout fix

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If duration variable value is 0 at this point, it's because
chip->vendor.duration wasn't filled by tpm_get_timeouts() yet.
This patch sets then the lowest timeout just to give enough
time for tpm_get_timeouts() to further succeed.

This fix avoids long boot times in case another entity attempts
to send commands to the TPM when the TPM isn't accessible.

Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Rajiv Andrade 2010-11-12 22:30:02 +01:00 committed by James Morris
parent 5403110943
commit c4ff4b829e
1 changed files with 6 additions and 4 deletions
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10
drivers/char/tpm/tpm.c
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@ -364,12 +364,14 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
tpm_protected_ordinal_duration[ordinal &
TPM_PROTECTED_ORDINAL_MASK];
if (duration_idx != TPM_UNDEFINED)
if (duration_idx != TPM_UNDEFINED) {
duration = chip->vendor.duration[duration_idx];
if (duration <= 0)
/* if duration is 0, it's because chip->vendor.duration wasn't */
/* filled yet, so we set the lowest timeout just to give enough */
/* time for tpm_get_timeouts() to succeed */
return (duration <= 0 ? HZ : duration);
} else
return 2 * 60 * HZ;
else
return duration;
}
EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);