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

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Message-ID: <20150930060455.GB7517@srcf.ucam.org>
Date:	Wed, 30 Sep 2015 07:04:55 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	peterhuewe@....de, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org, Marcel Selhorst <tpmdd@...horst.net>
Subject: Re: [PATCH 1/2] tpm, tpm_tis: use acpi_driver instead of pnp_driver

On Wed, Sep 30, 2015 at 08:56:12AM +0300, Jarkko Sakkinen wrote:

> 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.

The entries in acpi_pnp.c mean "If this device is declared in an ACPI 
table, create a PNP device". TPMs are kind of at the cutoff where some 
vendors may have shipped non-ACPI systems with TPMs that were declared 
via pnpbios, so there's a (small) risk that there are some people using 
TPMs tied to PNP devices without a corresponding ACPI device.

> 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.

I'd agree here.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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