If the TPM hits an error other than ENOENT during open(), retry for 5
seconds with 100ms polling delays. Also switch to on-demand opening
of TPM, so umount will not hit delays if tcsd keeps the TPM open at
shutdown time.
BUG=chrome-os-partner:15960
TEST=daisy build, mount ok with kernel patched to return EBUSY for a few
opens, platform_EncryptedStateful passes.
BRANCH=None
Change-Id: Ia597622bb54ccc4366be2a0c960c518406e6c0b2
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/39445
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
34d515c5c1