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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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      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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