linux-kernel - Re: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo Thinkpad E14 Gen 2 and 13s-IML

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Date:   Tue, 08 Aug 2023 08:12:57 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Jarkko Sakkinen" <jarkko@...nel.org>
Cc:     "Takashi Iwai" <tiwai@...e.de>, "Peter Huewe" <peterhuewe@....de>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        <linux-integrity@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo Thinkpad E14 Gen 2 and 13s-IML

On Mon, 07 Aug 2023 21:14:20 +0200,
Jarkko Sakkinen wrote:
> 
> On Mon Aug 7, 2023 at 2:01 PM UTC, Takashi Iwai wrote:
> > Like other Lenovo laptops, Thinkpad E14 Gen 2 and Thinkpad 13s-IML
> > also require to disable the tpm_tis interrupts for avoiding a boot
> > hang.
> >
> > Fixes: e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
> > Cc: <stable@...r.kernel.org> # v6.4+
> > Link: https://bugzilla.suse.com/show_bug.cgi?id=1213779
> > Signed-off-by: Takashi Iwai <tiwai@...e.de>
> >
> > ---
> >  drivers/char/tpm/tpm_tis.c | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> > index a98773ac2e55..0633823dc515 100644
> > --- a/drivers/char/tpm/tpm_tis.c
> > +++ b/drivers/char/tpm/tpm_tis.c
> > @@ -130,6 +130,22 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
> >  			DMI_MATCH(DMI_PRODUCT_NAME, "Laptop (13th Gen Intel Core)"),
> >  		},
> >  	},
> > +	{
> > +		.callback = tpm_tis_disable_irq,
> > +		.ident = "ThinkPad E14 Gen 2",
> > +		.matches = {
> > +			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> > +			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad E14 Gen 2"),
> > +		},
> > +	},
> > +	{
> > +		.callback = tpm_tis_disable_irq,
> > +		.ident = "ThinkBook 13s-IML",
> > +		.matches = {
> > +			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> > +			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ThinkBook 13s-IML"),
> > +		},
> > +	},
> >  	{
> >  		.callback = tpm_tis_disable_irq,
> >  		.ident = "ThinkPad T490s",
> > -- 
> > 2.35.3
> 
> As almost all issues are with Lenovo, I would instead just put:
> 
> 	{
> 		.callback = tpm_tis_disable_irq,
> 		.matches = {
> 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> 		},
> 	},
> 
> And delete the existing entries with vendor as "LENOVO".

Yeah, that will relieve pains better, too.


thanks,

Takashi