From: "Winkler, Tomas" <tomas.winkler-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Cc: Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
"tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org"
<tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
"Rafael J. Wysocki" <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] Add "shutdown" to "struct class".
Date: Mon, 15 May 2017 16:17:36 +0000 [thread overview]
Message-ID: <5B8DA87D05A7694D9FA63FD143655C1B641D8F02@hasmsx108.ger.corp.intel.com> (raw)
In-Reply-To: <20170515155110.GC3433-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
>
> On Sat, May 13, 2017 at 12:43:11PM +0000, Winkler, Tomas wrote:
> > > The TPM class has some common shutdown code that must be executed
> > > for all drivers. This adds some needed functionality for that
> >
> > The issue with this is, that on some platforms the only storage can be
> > eMMC and TPM is using it,. It has to be ensured that the storage
> > device won't go down before TPM2_shutdown is called. And there is no
> > direct device hierarchy to ensure an orderly shutdown.
>
> Something will have to use the new device links stuff to define that
> dependency, but that seems unrelated to this patch?
Yep, it's not directly related to this specific patch, this is more relevant particularly to TPM2_shutdown.
> Can the kernel really shut down the eMMC while the hidden platform stuff is
> still possibly using it? Goofy..
eMMC is single headed, so yes that can happen.
Tomas
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prev parent reply other threads:[~2017-05-15 16:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-12 23:32 [PATCH] Add "shutdown" to "struct class" Josh Zimmerman
[not found] ` <20170512233203.23659-1-joshz-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2017-05-13 12:43 ` Winkler, Tomas
2017-05-15 15:51 ` [tpmdd-devel] " Jason Gunthorpe
[not found] ` <20170515155110.GC3433-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-05-15 16:17 ` Winkler, Tomas [this message]
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