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authorRajiv Andrade <srajiv@linux.vnet.ibm.com>2010-11-12 22:30:02 +0100
committerJames Morris <jmorris@namei.org>2011-01-24 11:22:48 +1100
commitc4ff4b829ef9e6353c0b133b7adb564a68054979 (patch)
tree0b32c7b91763144ea587e2965f5a401eea3d537c /drivers/char
parent5403110943a2dcf1f96416d7a412a8b46895facd (diff)
downloadlinux-linaro-android-c4ff4b829ef9e6353c0b133b7adb564a68054979.tar.gz
TPM: Long default timeout fix
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 1f46f1cd922..36e0fa161c2 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -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);