linux-kernel - Re: Re: [PATCH v3 2/3] of: add optional options parameter to of_find_node_by

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Date:	Fri, 28 Nov 2014 15:33:08 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Ian Campbell <ijc@...ian.org>, Andrew Lunn <andrew@...n.ch>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Subject: Re: Re: [PATCH v3 2/3] of: add optional options parameter to of_find_node_by_path()

On Fri, Nov 28, 2014 at 3:25 PM, Grant Likely <grant.likely@...aro.org> wrote:
> On Fri, 28 Nov 2014 11:34:28 +0000
> , Leif Lindholm <leif.lindholm@...aro.org>
>  wrote:
>> On Fri, Nov 28, 2014 at 12:44:03AM +0000, Grant Likely wrote:
>> > > + separator = strchr(path, ':');
>> > > + if (separator && opts)
>> > > +         *opts = separator + 1;
>> > > +
>> >
>> > What about when there are no opts? Do we require the caller to make sure
>> > opts is NULL before calling the function (which sounds like a good
>> > source of bugs) or do we clear it on successful return?
>> >
>> > I think if opts is passed in, but there are no options, then it should
>> > set *opts = NULL.
>>
>> Yeah, oops.
>>
>> > There should be test cases for this also. Must set opts to NULL on
>> > successful return, and (I think) should leave opts alone on an
>> > unsuccessful search.
>>
>> I would actually argue for always nuking the opts - since that could
>> (theoretically) prevent something working by accident in spite of
>> error conditions.
>>
>> How about the below?
>
> Perfect, applied with one fixup below...

And by the way, let me say well done on this patch. It is elegantly
implemented within the framework already there.

g.
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