tree f6cc7d88cc239a7ac49ba8ea94efa28f98430803
parent cbb2d5e459f4e10b3f1d11c23c31aa5d7c21e34c
author Rajiv Andrade <srajiv@linux.vnet.ibm.com> 1335299897 -0300
committer Rajiv Andrade <srajiv@linux.vnet.ibm.com> 1339538029 -0300

TPM: chip disabled state erronously being reported as error

tpm_do_selftest() attempts to read a PCR in order to
decide if one can rely on the TPM being used or not.
The function that's used by __tpm_pcr_read() does not
expect the TPM to be disabled or deactivated, and if so,
reports an error.

It's fine if the TPM returns this error when trying to
use it for the first time after a power cycle, but it's
definitely not if it already returned success for a
previous attempt to read one of its PCRs.

The tpm_do_selftest() was modified so that the driver only
reports this return code as an error when it really is.

Reported-and-tested-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>