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

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Message-Id: <201005132354.24259.rjw@sisk.pl>
Date:	Thu, 13 May 2010 23:54:24 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Daniel Walker <dwalker@...o99.com>,
	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>,
	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>, Greg KH <gregkh@...e.de>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

On Thursday 13 May 2010, Tony Lindgren wrote:
> * Daniel Walker <dwalker@...o99.com> [100513 14:28]:
> > 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.
> > 
> > > Practically, as long as the opportunistic suspend is out of tree, there will be
> > > a _growing_ number of out-of-tree drivers out there, which is not acceptable
> > > in the long run.
> > 
> > I don't see why your saying that. These driver should work with out all
> > of this, which means they can get mainlined right now.
> 
> I agree with Daniel here. We should keep merging the drivers separate
> from the suspend blocks issues.

Unfortunately, that's completely unrealistic.  Please refer to the Greg's reply
for details.

Rafael
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