linux-kernel - Re: [PATCH 2/9] irqdomain: Introduce __irq_create

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Date:	Mon, 23 Sep 2013 21:14:30 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/9] irqdomain: Introduce __irq_create_mapping()

On Mon, Sep 16, 2013 at 10:31 AM, Thierry Reding
<thierry.reding@...il.com> wrote:

> This is a version of irq_create_mapping() that propagates the precise
> error code instead of returning 0 for all errors. It will be used in
> subsequent patches to allow further propagation of error codes.
>
> To avoid code duplication, implement irq_create_mapping() as a wrapper
> around the new __irq_create_mapping().
>
> Signed-off-by: Thierry Reding <treding@...dia.com>

Surprise! I don't like this.

I think it is better to first go over the call sites and make them
all handle negative return numbers rather than pushing the
obscure __interface.

I know from patch 0 that you think it's too much to change these
127 call sites but I don't think so, and I'm happy to merge one
big patch changing all the 20 users in drivers/gpio.

Likewise with the 11 consumers in drivers/pinctrl.

It's just a a few archs+subsystems and it's just plain work.

So do that first.

Yours,
Linus Walleij
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