linux-kernel - Re: [PATCH v5 1/3] power-domain: add power domain drivers for Rockchip platform

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Date:	Thu, 23 Oct 2014 14:25:40 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Hong jinkun <jinkun.hong@...k-chips.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Doug Anderson <dianders@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jack Dai <jack.dai@...k-chips.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v5 1/3] power-domain: add power domain drivers for
 Rockchip platform

On 22 October 2014 19:45, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> On Wed, Oct 22, 2014 at 09:58:34AM +0200, Ulf Hansson wrote:
>>
>> Using the devm_*API is supposed to work from here. I have kept this in
>> mind, while we added the new dev_pm_domain_attach|detach() API. The
>> buses also handles -EPROBE_DEFER.
>
> How do you ensure this? You have no control over from where API is
> called. If I happen to call it form anywhere but bus probe code path I
> will be leaking memory at least until the device is unbound completely
> (which would be in this case an unrelated event).

You are right, devm_*API is currently not a good idea! I didn't
realize that the ->attach_dev() callback was invoked from
__pm_genpd_add_device(). Sorry for the noise.

Anyway,  I am working on adding the option to return -EPROBE_DEFER
from the ->attach_dev() callback, since that could be useful to
support.

Kind regards
Uffe
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