linux-kernel - Re: [PATCH 3/5] of: Only call notifiers when node is attached

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Message-ID: <CACxGe6vaPBcU++_JWJYVcD5r-Z2c2ZjxWfrmo4Qmetbg+E-3oA@mail.gmail.com>
Date:	Thu, 6 Nov 2014 12:47:19 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>
Subject: Re: [PATCH 3/5] of: Only call notifiers when node is attached

On Thu, Nov 6, 2014 at 12:33 PM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
> Hi Grant,
>
>> On Nov 5, 2014, at 23:39 , Grant Likely <grant.likely@...retlab.ca> wrote:
>>
>> On Tue, 28 Oct 2014 22:33:51 +0200
>> , Pantelis Antoniou <pantelis.antoniou@...sulko.com>
>> wrote:
>>> Make sure we call notifier only when the node is attached.
>>> When a detatched tree is being constructed we do not want the
>>> notifiers to fire at all.
>>
>> The description does not match what the patch does. The patch moves the
>> test into of_{add,remove,update}_property() and out of
>> of_property_notify() itself. That leaves one other caller of
>> of_property_notify(); __of_changeset_entry_notify(). The effect of this
>> patch is that applying a changeset will cause notifiers to be fired for
>> each property modified in a changeset. The comment says nothing about
>> the change in behaviour and it sounds like it is a bug fix when it
>> doesn't actually change the behaviour at all for the
>> of_{add,remove,update}_property() paths.
>>
>> This needs a better changelog. It needs to describe what the effects of
>> the patch are and why the change is being made. When someone is
>> bisecting a problem and they land on this change, the changelog needs to
>> give them a good idea about what is going on and why.
>>
>
> Valid points. In fact I performed some tests and with this reverted things
> still work.
>
> The rationale behind this is for when nodes/properties are removed in the overlay,
> but since we don't support this for now, we never hit the case where it was
> needed.
>
> Please remove from the patch series, I'll revisit this when I add the removal
> functionality.

Cool, thanks.

g.
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