Re: [PATCH v3] tpm: Enable hwrng only for Pluton on AMD CPUs

[Jarkko Sakkinen]

On Wed Aug 23, 2023 at 9:58 PM EEST, Mario Limonciello wrote:
> On 8/23/2023 12:40, Jarkko Sakkinen wrote:
> > On Wed Aug 23, 2023 at 11:23 AM EEST, Paul Menzel wrote:
> >> Dear Jarkko,
> >>
> >>
> >> Thank you for your patch.
> >>
> >>
> >> Am 23.08.23 um 01:15 schrieb Jarkko Sakkinen:
> >>> The vendor check introduced by commit 554b841d4703 ("tpm: Disable RNG for
> >>> all AMD fTPMs") doesn't work properly on a number of Intel fTPMs.  On the
> >>> reported systems the TPM doesn't reply at bootup and returns back the
> >>> command code. This makes the TPM fail probe.
> >>>
> >>> Since only Microsoft Pluton is the only known combination of AMD CPU and
> >>> fTPM from other vendor, disable hwrng otherwise. In order to make sysadmin
> >>> aware of this, print also info message to the klog.
> >>>
> >>> Cc: stable@xxxxxxxxxxxxxxx
> >>> Fixes: 554b841d4703 ("tpm: Disable RNG for all AMD fTPMs")
> >>> Reported-by: Todd Brandt <todd.e.brandt@xxxxxxxxx>
> >>> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217804
> >>> Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> >>
> >> Mario’s patch also had the three reporters below listed:
> >>
> >> Reported-by: Patrick Steinhardt <ps@xxxxxx>
> >> Reported-by: Ronan Pigott <ronan@xxxxxx>
> >> Reported-by: Raymond Jay Golo <rjgolo@xxxxxxxxx>
> > 
> > The problem here is that checkpatch throws three warnings:
> > 
> > WARNING: Reported-by: should be immediately followed by Closes: with a URL to the report
> > #19:
> > Reported-by: Patrick Steinhardt <ps@xxxxxx>
> > Reported-by: Ronan Pigott <ronan@xxxxxx>
> > 
> > WARNING: Reported-by: should be immediately followed by Closes: with a URL to the report
> > #20:
> > Reported-by: Ronan Pigott <ronan@xxxxxx>
> > Reported-by: Raymond Jay Golo <rjgolo@xxxxxxxxx>
> > 
> > WARNING: Reported-by: should be immediately followed by Closes: with a URL to the report
> > #21:
> > Reported-by: Raymond Jay Golo <rjgolo@xxxxxxxxx>
> > Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> > 
>
> FWIW I observed the same checkpatch warning when I submitted my version 
> of the patch.  I figured it's better to ignore the warning and attribute 
> everyone who reported the issue affected them.

OK so:

1. checkpatch.pl is part of the kernel process.
2. Bugzilla is not part of the kernel process.

Why emphasis on 1?

BR, Jarkko