There were a few problem here:
- TPM2_Shutdown results in a response that we need to either process
or ignore, otherwise any tpm20_write or tpm20_harvest call will
trivially hang on an `sc->pending_data_length != 0`
- We should have a matching TPM2_Startup upon resume to restore any
state that should have persisted
- We must drain the harvest task before we suspend to avoid problems
there
This commit is sufficient to avoid breaking suspend/resume.
PR: 291067
Fixes: a2d5ed9442 ("Introduce driver for TPM 2.0 in CRB and [...]")
Fixes: 4ee7d3b011 ("Allow using TPM as entropy source.")
Co-authored-by: markj (D53835)
Tested by: garga
Differential Revision: https://reviews.freebsd.org/D55074
Kyle Evans
38a4995eb5