Re: [PATCH] Fix Atmel TPM crash caused by too frequent queries

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On Mon, Sep 28, 2020 at 10:49:56AM -0700, Hao Wu wrote:
> Hi Jarkko,
> 
> https://github.com/torvalds/linux/commit/9f3fc7bcddcb51234e23494531f93ab60475e1c3 
> Is the one introducing the issue since 4.14. Then the other three commits
> changed the relevant code a bit. Probably you can check the timestamp / release version
> on each commit to understand the relationship.
> 
> I think the original patch commit message can help you understand the root cause.
> Attaching the commit here for your convenience.
> 
> Thanks
> Hao

Please, again, when you respond quote properly instead of putting your
response on top. Thank you.

Yes, I know the issue and it is already documented also in the James'
earlier patch that did a similar change. I.e. for some reason some TPM's
(or the bus itself) do not like poking it too often.

So: what if you revert on using msleep(TPM_TIMEOUT) in
wait_for_tpm_stat(), i.e. revert to the behaviour before the
aformentioned commit?

/Jarkko



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