Re: [PATCH] tpm: vtpm_proxy: Do not run tpm2_shutdown

[Stefan Berger]

On 05/25/2017 04:44 PM, Jason Gunthorpe wrote:
> On Thu, May 25, 2017 at 04:32:50PM -0400, Stefan Berger wrote:
>
> > It doesn't hang. Everything is torn down immediately. What is primarily
> > annoying are these two log messages:
> > tpm tpm0: tpm_transmit: tpm_send: error -32
> > tpm tpm0: transmit returned -32 while stopping the TPM
> I think it would be better to change the core to suppress that logging
> if the FD is closed.

This particular command will never reach anyone listening on the proxy's 
file descriptor since the tear-down only begins when the front- and 
backend are closed.
The logging happens somewhere else than where the error occurs. What is 
the best way to suppress the logging? Remove it entirely  -- probably 
not. Return a special error code that doesn't get logged? Return a 2nd 
parameter that indicates this condition? It's not clear to me. Why not 
just prevent the command from being sent if it will never reach its 
intended destination ?

  Stefan

> Jason