linux-kernel - RE: [PATCH] tpm: separate cmd_ready/go_idle from runtime

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Message-ID: <5B8DA87D05A7694D9FA63FD143655C1B9D940DC6@hasmsx108.ger.corp.intel.com>
Date:   Wed, 30 May 2018 10:52:28 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC:     Jason Gunthorpe <jgg@...pe.ca>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] tpm: separate cmd_ready/go_idle from runtime_pm

> 
> On Wed, May 23, 2018 at 01:48:17PM +0000, Winkler, Tomas wrote:
> >
> > > On Tue, May 22, 2018 at 09:27:46AM +0000, Winkler, Tomas wrote:
> > > > >
> > > > > On Wed, May 16, 2018 at 10:46:00PM +0300, Tomas Winkler wrote:
> > > > > > New wrappers are added tpm_cmd_ready() and tpm_go_idle()
> > > wrappers
> > > > > > to streamline tpm_try_transmit code. TPM_TRANSMIT_UNLOCKED
> > > > > > flag
> > > is
> > > > > abused
> > > > > > to resolve tpm spaces recursive calls to tpm_transmit().
> > > > >
> > > > > This looks good and all but I don't think we want to abuse
> > > > > anything in the driver code, do we?
> > > >
> > > > It's not abuse just the flag UNLOCKED is not really named
> > > > correctly I think this has to be backported so wanted to do less invasive
> change.
> > >
> > > It should be renamed anyway and possible merge conflicts are not
> > > hard to sort out in this change. Can you rename it as SPACE?
> >
> > Not sure, I believe UNLOCKED is still better name than SPACE, I'm not
> > sure this is Do you also want to remove TPM_TRANSMIT_RAW?
> > clk_enable is handling its own anti recursion counter 'data-
> >clkrun_enabled'
> > but it should be all handled under one flag I guess.
> >
> > > Right, and even without rename this will probably cause merge
> > > conflicts at least in v4.4 an v4.9 since in-kernel RM landed in
> > > v4.12, so not much gain not do the rename :-)
> >
> > I belive we should do minimal change and the big cleanup after that.
> > Not sure, I believe UNLOCKED is still better name than SPACE even it wasn't
> the original intention.
> > No the SPACE is the issue, but any recursion call into tpm_transmit. A
> > bigger change is needed and rename to SPACE would be just another
> intermediat change.
> >
> > Please reconsider.
> >
> > Thanks
> > Tomas
> 
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>


Does it mean you're Okay with the patch now?
Thanks
Tomas