linux-kernel - Re: [PATCH v3] Add "shutdown" to "struct class".

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Message-ID: <20170525224011.whm56yzautdo74cj@intel.com>
Date:   Thu, 25 May 2017 15:40:11 -0700
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Josh Zimmerman <joshz@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        tpmdd-devel@...ts.sourceforge.net,
        Greg KH <gregkh@...uxfoundation.org>, jmorris@...ei.org
Subject: Re: [PATCH v3] Add "shutdown" to "struct class".

Josh,

On Thu, May 25, 2017 at 06:41:18PM +0200, Greg Kroah-Hartman wrote:
> On Thu, May 25, 2017 at 09:24:30AM -0700, Josh Zimmerman wrote:
> > On Thu, May 25, 2017 at 9:09 AM, Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > > On Thu, May 25, 2017 at 08:40:28AM -0700, Josh Zimmerman wrote:
> > >> Thanks, Greg.
> > >>
> > >> Greg, Jarkko: Do either of you you have any objections to me
> > >> backporting these changes to 4.4 and 4.9? I'd like to make sure that
> > >> at least the couple most recent LTS kernels have this patch.
> > >
> > > Why?  What bug does this solve?
> > If a TPM2 device has power removed without a TPM2_Shutdown being
> > issued, it will increment its "dictionary attack" counter. After that
> > counter reaches a certain value, the TPM2 device will lock the user
> > out. Adding the shutdown callback allows the TPM kernel driver to send
> > TPM2_Shutdown to all TPM2 devices.
> 
> Is all of that in the tpm patch description?  If so, great, if not,
> please add it.
> 
> > > If it meets the rules of
> > > Documentation/stable_kernel_rules.txt (or whereever that file moved to),
> > > that's fine with me.
> > Documentation/process/stable-kernel-rules.rst, right? To comply with
> > option 1 referred to there (Adding the appropriate "Cc:" to the
> > description), should I send a new patch email or just reply to this
> > one and quote the relevant part? (I don't believe the document
> > specifies.)
> 
> You (or who ever applies these patches) needs to add the cc: stable tag
> to them.  I suggest resend these, as a patch series, with that in it, so
> that it all makes more sense and the tpm maintainer has an easy job of
> it.
> 
> thanks,
> 
> greg k-h

Can you send one more patch set with these two patches and Cc-tags and
refined descriptions where needed. If you do this, I will apply them to
my tree and send PR to James Morris. Thank you.

/Jarkko