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Old 01-05-2012, 12:16 PM
Stefan Berger
Default Bug#649033: Fix kernel boot delay due to hang in tpm_tis

Can someone who experiences the delay during the boot please apply the
patch below? Please let me know whether it solves the problem.

This patch adds a delay after aborting a command. Some TPMs need
this and will not process the subsequent command correctly otherwise.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

drivers/char/tpm/tpm_tis.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux-2.6/drivers/char/tpm/tpm_tis.c
================================================== =================
--- linux-2.6.orig/drivers/char/tpm/tpm_tis.c
+++ linux-2.6/drivers/char/tpm/tpm_tis.c
@@ -432,6 +432,9 @@ static int probe_itpm(struct tpm_chip *c
itpm = rem_itpm;
+ /* some TPMs need a break here otherwise they will not work
+ * correctly on the immediately subsequent command */
+ msleep(chip->vendor.timeout_b);
release_locality(chip, chip->vendor.locality, 0);

return rc;

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