linux-kernel - Re: [PATCH 08/13] gpio: sysfs: implement class.get

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Message-ID: <CAAObsKDYvgxuxH0ZpXaTrsjLYOaZ-W_evOWfLLTNFRFYMra5LQ@mail.gmail.com>
Date:	Tue, 30 Jun 2015 17:00:53 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alexander Holler <holler@...oftware.de>,
	Alexandre Courbot <gnurou@...il.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kumar Gala <galak@...eaurora.org>, Len Brown <lenb@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Robert Moore <robert.moore@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Terje Bergström <tbergstrom@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH 08/13] gpio: sysfs: implement class.get_dependencies()

On 17 June 2015 at 19:40, Mark Brown <broonie@...nel.org> wrote:
> On Wed, Jun 17, 2015 at 03:42:18PM +0200, Tomeu Vizoso wrote:
>
>> +static bool strends(const char *str, const char *postfix)
>> +{
>> +     if (strlen(str) < strlen(postfix))
>> +             return false;
>> +
>> +     return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
>> +}
>
> This is named like (and looks like) a generic fuction, shouldn't it be
> in string.h or something?

Yeah, will put it there.

>> +static void add_dependency(struct fwnode_handle *fwnode,
>> +                        struct list_head *list)
>> +{
>> +     struct fwnode_dependency *dep;
>> +
>> +     dep = kzalloc(sizeof(*dep), GFP_KERNEL);
>> +     if (!dep)
>> +             return;
>> +
>> +     INIT_LIST_HEAD(&dep->dependency);
>> +     dep->fwnode = fwnode;
>> +
>> +     list_add_tail(&dep->dependency, list);
>> +}
>
> Might be worth putting this in generic code, it looks pretty generic?  I
> have to say I'm unclear what frees the returned list.

Agreed.

>> +     if (!is_of_node(fwnode))
>> +             return NULL;
>> +
>> +     np = of_node(fwnode);
>> +     if (!np)
>> +             return NULL;
>
> Presumably the first check could be dropped?

That's right.

>> +     list = kzalloc(sizeof(*list), GFP_KERNEL);
>> +     if (!list)
>> +             return NULL;
>
> Might it make sense for the core to allocate the head of the list and
> just ask the classes to add to the list?  We're going to want to merge
> the dependencies from multiple subsystems and that saves allocating
> heads that may never get anything added to them.

Yes, I have gone with that advice and it looks better that way.

Thanks,

Tomeu
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