linux-kernel - Re: [PATCH v5 10/10] tpm, tpm

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Date:   Wed, 15 Jun 2022 23:54:49 +0200
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Jarkko Sakkinen <jarkko@...nel.org>, LinoSanfilippo@....de,
        James.Bottomley@...senpartnership.com,
        twawrzynczak <twawrzynczak@...omium.org>
Cc:     peterhuewe@....de, jgg@...pe.ca, stefanb@...ux.vnet.ibm.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        l.sanfilippo@...bus.com, lukas@...ner.de, p.rosenberger@...bus.com
Subject: Re: [PATCH v5 10/10] tpm, tpm_tis: Enable interrupt test

On Wed, 2022-06-15 at 21:26 +0300, Jarkko Sakkinen wrote:
> On Fri, Jun 10, 2022 at 01:08:46PM +0200, LinoSanfilippo@....de wrote:
> > From: Lino Sanfilippo <l.sanfilippo@...bus.com>
> > 
> > The test for interrupts in tpm_tis_send() is skipped if the flag
> > TPM_CHIP_FLAG_IRQ is not set. Since the current code never sets the flag
> > initially the test is never executed.
> > 
> > Fix this by setting the flag in tpm_tis_gen_interrupt() right after
> > interrupts have been enabled.
> > 
> > Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
> > ---
> >  drivers/char/tpm/tpm_tis_core.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/char/tpm/tpm_tis_core.c
> > b/drivers/char/tpm/tpm_tis_core.c
> > index e5edf745fb23..be229c173f10 100644
> > --- a/drivers/char/tpm/tpm_tis_core.c
> > +++ b/drivers/char/tpm/tpm_tis_core.c
> > @@ -774,11 +774,16 @@ static int tpm_tis_gen_interrupt(struct tpm_chip
> > *chip)
> >         if (ret < 0)
> >                 return ret;
> >  
> > +       chip->flags |= TPM_CHIP_FLAG_IRQ;
> > +
> >         if (chip->flags & TPM_CHIP_FLAG_TPM2)
> >                 ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
> >         else
> >                 ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> > desc, 0);
> >  
> > +       if (ret)
> > +               chip->flags &= ~TPM_CHIP_FLAG_IRQ;
> > +
> >         release_locality(chip, 0);
> >  
> >         return ret;
> > -- 
> > 2.36.1
> > 
> 
> James, do you have a chance to test this on your side? Thanks.
> 
> BR, Jarkko

Hi guys,

for me this series causes boot problems - somehow feels like an interrupt
storm...
Not sure yet, which commit is causing that. I'll do more testing tomorrow.
@Tim could you test on any of your devices, please?

BR
Michael