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Message-ID: <4cdb6399d803d37a883d1a2fbe119c0a14610106.camel@linux.ibm.com>
Subject: Re: [PATCH 1/1] char: tpm: handle HAS_IOPORT dependencies
From: Niklas Schnelle <schnelle@linux.ibm.com>
To: Arnd Bergmann <arnd@kernel.org>, Peter Huewe <peterhuewe@gmx.de>,
        Jarkko
	Sakkinen <jarkko@kernel.org>
Cc: linux-integrity@vger.kernel.org, Heiko Carstens <hca@linux.ibm.com>,
        linux-kernel@vger.kernel.org
Date: Thu, 04 Apr 2024 17:41:45 +0200
In-Reply-To: <95a63afe-ccd7-4551-86af-00b7fb0d8ff9@app.fastmail.com>
References: <20240404105840.3396821-1-schnelle@linux.ibm.com>
	 <20240404105840.3396821-2-schnelle@linux.ibm.com>
	 <95a63afe-ccd7-4551-86af-00b7fb0d8ff9@app.fastmail.com>
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On Thu, 2024-04-04 at 13:17 +0200, Arnd Bergmann wrote:
> On Thu, Apr 4, 2024, at 12:58, Niklas Schnelle wrote:
> > diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_inf=
ineon.c
> > index 9c924a1440a9..99c6e565ec8d 100644
> > --- a/drivers/char/tpm/tpm_infineon.c
> > +++ b/drivers/char/tpm/tpm_infineon.c
> > @@ -26,7 +26,9 @@
> >  #define	TPM_MAX_TRIES		5000
> >  #define	TPM_INFINEON_DEV_VEN_VALUE	0x15D1
> >=20
> > +#ifdef CONFIG_HAS_IOPORT
> >  #define TPM_INF_IO_PORT		0x0
> > +#endif
> >  #define TPM_INF_IO_MEM		0x1
>=20
> I think hiding this definition in this version of a patch
> results in a build failure because of the assignment that
> you are not stubbing out:
>=20
>         /* read IO-ports through PnP */
>         if (pnp_port_valid(dev, 0) && pnp_port_valid(dev, 1) &&
>             !(pnp_port_flags(dev, 0) & IORESOURCE_DISABLED)) {
>                 tpm_dev.iotype =3D TPM_INF_IO_PORT;
>=20
> I don't know what changed since the earlier versions I tested,
> or if I just missed it, but I think you either have to remove
> the #ifdef above or add another one in tpm_inf_pnp_probe().
>=20
>     Arnd

Good find! I do see the same #ifdef in v5 but maybe something else
changed. I think this was also hidden during both my local test builds
and kernel test robot because of the PNP -> ACPI || ISA dependency
which I think implies HAS_IOPORT. So unless I'm missing something we
can't currently get here with HAS_IOPORT=3Dn. Maybe that changed?

I'm now thinking maybe keeping TPM_INF_IO_PORT is the cleaner choice.
It saves us 4 lines of #ifdeffery at the cost of one sometimes "unused"
define.

Thanks,
Niklas