linux-kernel - Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

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Message-ID: <20120731141328.GS4468@opensource.wolfsonmicro.com>
Date:	Tue, 31 Jul 2012 15:13:29 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	Alex Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Stephen Warren <swarren@...dia.com>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

On Tue, Jul 31, 2012 at 12:56:40PM +0200, Thierry Reding wrote:
> On Tue, Jul 31, 2012 at 07:32:20PM +0900, Alex Courbot wrote:

> > The thing is that I am not sure what happens to the platform data
> > once probe() is done. Isn't it customary to mark it with __devinit
> > and have it freed after probing is successful?

> No, platform data should stay around forever. Otherwise, consider what
> would happen if your driver is built as a module and you unload and load
> it again.

__devinit can be discarded if you disable enough kernel features,
HOTPLUG is the main one IIRC, modules might also need to go - drivers
really ought to take a copy of platform data they plan to use at
runtime, though practically speaking you have to try to trigger any
problems.
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