linux-kernel - Re: [tpmdd-devel] [PATCH] tpm: fix suspend/resume paths for TPM 2.0

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Date:	Tue, 27 Jan 2015 18:57:22 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Scot Doyle <lkml14@...tdoyle.com>
Cc:	peterhuewe@....de, ashley@...leylai.com,
	christophe.ricard@...il.com, jason.gunthorpe@...idianresearch.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net,
	trousers-tech@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH] tpm: fix suspend/resume paths for TPM 2.0

On Tue, 2015-01-27 at 16:52 +0000, Scot Doyle wrote:
> On Tue, 27 Jan 2015, Jarkko Sakkinen wrote:
> > Fixed suspend/resume paths for TPM 2.0 and consolidated all the
> > associated code to the tpm_pm_suspend() and tpm_pm_resume()
> > functions. Resume path should be handled by the firmware, i.e.
> > Startup(CLEAR) for hibernate and Startup(STATE) for suspend.
> > 
> > There might be some non-PC embedded devices in the future where
> > Startup() is not the handled by the FW but fixing the code for
> > those IMHO should be postponed until there is hardware available
> > to test the fixes although extra Startup in the driver code is
> > essentially a NOP.
> > 
> > Reported-by: Peter Hüwe <PeterHuewe@....de>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > ---
> 
> ...
> 
> > --- a/drivers/char/tpm/tpm_tis.c
> > +++ b/drivers/char/tpm/tpm_tis.c
> > @@ -865,25 +865,23 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
> >  static int tpm_tis_resume(struct device *dev)
> >  {
> 
> ...
> 
> > +	/* TPM 1.2 requires self-test on resume. */
> > +	if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
> > +		ret = tpm_do_selftest(chip);
> > +		if (ret < 0)
> > +			return ret;
> 
> Just to note, the return value from tpm_do_selftest() on TPM 1.2 chips was 
> previously ignored. Mine does return 0.

Right. I can update the patch to ignore return value if the majority
wants that.

/Jarkko

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