tree d097ad703bcc2f25872bac17a75088a2af4ea725
parent dad79cb89254ce646906846b0f0cf7995d626710
author Andi Shyti <andi.shyti@gmail.com> 1338223365 +0200
committer Rajiv Andrade <srajiv@linux.vnet.ibm.com> 1339538031 -0300

tpm: check the chip reference before using it

If a driver calls tpm_dev_vendor_release for a device already released
then the driver will oops.

Signed-off-by: Andi Shyti <andi.shyti@gmail.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>