linux-kernel - Re: [PATCH 1/2] tpm, tpm_tis: use acpi_driver instead of pnp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 30 Sep 2015 08:56:12 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	peterhuewe@....de, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org, mjg59@...f.ucam.org,
	Marcel Selhorst <tpmdd@...horst.net>
Subject: Re: [PATCH 1/2] tpm, tpm_tis: use acpi_driver instead of pnp_driver

On Tue, Sep 29, 2015 at 11:26:53AM -0600, Jason Gunthorpe wrote:
> On Tue, Sep 29, 2015 at 08:07:10PM +0300, Jarkko Sakkinen wrote:
> 
> > -static struct pnp_device_id tpm_pnp_tbl[] = {
> > +static struct acpi_device_id tpm_acpi_tbl[] = {
> >  	{"PNP0C31", 0},		/* TPM */
> >  	{"ATM1200", 0},		/* Atmel */
> >  	{"IFX0102", 0},		/* Infineon */
> > @@ -925,28 +941,34 @@ static struct pnp_device_id tpm_pnp_tbl[] = {
> >  	{"", 0},		/* User Specified */
> >  	{"", 0}			/* Terminator */
> >  };
> 
> Is this OK? I don't know alot about x86 PNP, but I thought the
> pnp_device_id scheme would work with ACPI and legacy PNPBIOS stuff,
> and changing to ACPI means ACPI only?
> 
> If so, should we care? Is there a spec for non-ACPI TPM discovery we
> need to be following here?

I found at least all the IDs listed from drivers/acpi/acpi_pnp.c but you
might be right that they might be (don't know) with pnpbios.

Maybe a better solution would to have two tables and have only MSFT0101
in tpm_acpi_tbl in order to make sure that old functionality is not
broken up because we want this also to the stable kernels.

/Jarkko
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/