linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

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Date:	Thu, 13 May 2010 14:46:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg@...hat.com>,
	Brian Swetland <swetland@...gle.com>,
	Paul Walmsley <paul@...an.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Alan Stern <stern@...land.harvard.edu>, magnus.damm@...il.com,
	Theodore Ts'o <tytso@....edu>,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>,
	Benoît Cousson <b-cousson@...com>,
	linux-omap@...r.kernel.org, Vitaly Wool <vitalywool@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

On Thu, May 13, 2010 at 02:33:29PM -0700, Daniel Walker wrote:
> On Thu, 2010-05-13 at 23:27 +0200, Rafael J. Wysocki wrote:
> 
> > Because someone would have to remove suspend blockers (or rather wakelocks)
> > from the drivers, test that they work correctly without suspend blockers and
> > submit the modified versions.  Going forward, every party responsible for such
> > a driver would have to maintain an out-of-tree version with suspend blockers
> > (or wakelocks) anyway, so the incentive to do that is zero.
> 
> They should work without wakelock since wakelock are optional .. I mean
> there's nothing in suspend blockers I've seen that indicates it's
> required for some drivers to work. So it's just a matter of patching out
> the wakelocks, with no need to re-test anything.
> 
> You get the driver mainlined, then maintain a small patch to add
> wakelocks. Not hard at all , with lots of incentive to do so since you
> don't have to maintain such a large block of code out of tree.

Sorry, but it doesn't seem to work that way.  Look at the large number
of out-of-tree android device drivers that remain sitting there because
of the lack of this interface being in the kernel.

Also note that such a driver, without wakelocks, would never get tested,
and so, things start quickly diverging.

thanks,

greg k-h
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