linux-kernel - Re: [RFC] tpm_tis: Fix subsequent suspend failures

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Date:	Wed, 23 Jun 2010 12:18:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Cc:	Helmut Schaa <helmut.schaa@...glemail.com>,
	tpmdd-devel@...ts.sourceforge.net,
	Debora Velarde <debora@...ux.vnet.ibm.com>,
	David Safford <safford@...son.ibm.com>, jmorris@...ei.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] tpm_tis: Fix subsequent suspend failures

On Tue, 22 Jun 2010 00:08:44 -0300
Rajiv Andrade <srajiv@...ux.vnet.ibm.com> wrote:

> On Wed, 2010-06-09 at 15:11 +0200, Helmut Schaa wrote:
> > Fix subsequent suspends by issuing tpm_continue_selftest during resume.
> > Otherwise, the tpm chip seems to be not fully initialized and will reject
> > the save state command during suspend, thus preventing the whole system
> > to suspend.
> > 
> > Signed-off-by: Helmut Schaa <helmut.schaa@...glemail.com>
> > ---
> > 
> > Not sure if the platform resume method should be fixed in the same way.
> > Plase review.
> > 
> > Thanks,
> > Helmut
> > 
> >  drivers/char/tpm/tpm_tis.c |    9 ++++++++-
> >  1 files changed, 8 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> > index 24314a9..1030f84 100644
> > --- a/drivers/char/tpm/tpm_tis.c
> > +++ b/drivers/char/tpm/tpm_tis.c
> > @@ -623,7 +623,14 @@ static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
> > 
> >  static int tpm_tis_pnp_resume(struct pnp_dev *dev)
> >  {
> > -	return tpm_pm_resume(&dev->dev);
> > +	struct tpm_chip *chip = pnp_get_drvdata(dev);
> > +	int ret;
> > +
> > +	ret = tpm_pm_resume(&dev->dev);
> > +	if (!ret)
> > +		tpm_continue_selftest(chip);
> > +
> > +	return ret;
> >  }
> > 
> >  static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
>
> Sorry the ones on CC, previous message got messed up by the mail client.
> 
> This patch fixes https://bugzilla.kernel.org/show_bug.cgi?id=16256
> 
> Link to original post given it wasn't submitted to LKML originally:
> http://marc.info/?l=tpmdd-devel&m=127609160616162&w=2
> 
> Acked-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
> 

(top-posting repaired.  Please don't do that).

This wasn't a very good way to send a patch.  I edited the diff,
reconstructed the patch and then assembled a decent-looking changelog. 
I also changed your acked-by to the required signed-off-by, because you
were on the patch's delivery path.

Pretty please: next time, prepare a proper mergeable patch with the
correct attributions and signoffs?  Thanks.
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