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

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Message-ID: <1273786409.19100.104.camel@c-dwalke-linux.qualcomm.com>
Date:	Thu, 13 May 2010 14:33:29 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	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>, Greg KH <gregkh@...e.de>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

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.

Daniel

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