Re: [PATCH] tpm: Revert "tpm: fix invalid locking in NONBLOCKING mode"

[Alex Guzman]

On Tue, 2020-05-26 at 14:33 -0700, Tadeusz Struk wrote:
> On 5/26/20 1:00 PM, James Bottomley wrote:
> > I don't think there is a root cause other than a TIS TPM is getting
> > annoyed by us cycling localities too rapidly because we don't do an
> > actual TPM operation between request and relinquish.  Since the
> > first
> > request/relinquish seems unnecessary for the async case, moving the
> > ops
> > get eliminates the problem.
> 
> Could be, so maybe we could try both patches.
> More debug info on the error path won't hurt.
> Thanks,
> Tadeusz

With your logging patch, I consistently see this message in dmesg when
tpm2_getcap fails:

tpm tpm0: request_locality: failed to request locality 0 after 750 ms