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tpm_tis: add delay after aborting command

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commit a927b81317 upstream.

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

It's worth noting that a TPM randomly failing to process a command,
maps to randomly failing suspend/resume operations.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Berger
2011-11-11 12:57:06 -05:00
committed by Greg Kroah-Hartman
parent 64d4ed6a2f
commit 2c6b180537
1 changed files with 3 additions and 0 deletions
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3
drivers/char/tpm/tpm_tis.c
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@@ -432,6 +432,9 @@ static int probe_itpm(struct tpm_chip *chip)
out:
itpm = rem_itpm;
tpm_tis_ready(chip);
/* 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;