linux-kernel - Re: [PATCH V4 3/4] gpio: tegra: Get rid of all file scoped global variables

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Message-ID: <20160425101101.GC20630@ulmo.ba.sec>
Date:	Mon, 25 Apr 2016 12:11:01 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	swarren@...dotorg.org, linus.walleij@...aro.org, gnurou@...il.com,
	linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 3/4] gpio: tegra: Get rid of all file scoped global
 variables

On Mon, Apr 25, 2016 at 03:23:22PM +0530, Laxman Dewangan wrote:
> 
> On Monday 25 April 2016 03:30 PM, Thierry Reding wrote:
> > * PGP Signed by an unknown key
> > 
> > On Fri, Apr 22, 2016 at 03:39:13PM +0530, Laxman Dewangan wrote:
> > [...]
> > > diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
> > [...]
> > >   static struct gpio_chip tegra_gpio_chip = {
> > This variable is still file-scoped. Why not get rid of it at the same
> > time? It's rather pointless to remove all file-scoped variables except a
> > single one, because now the driver still isn't properly equipped to deal
> > with multiple instances (however theoretical that may be).
> > 
> 
> Yaah, Alex also pointed that to have the instance of gpio_chip in
> tegra_gpio_info and then do as
> tgi->gc = tegra_gpio_chip.
> 
> 
> same for irq_chip also.
> 
> 
> I hope this will resolve the concern.

An alternative would be to do away with tegra_gpio_chip altogether and
instead assign the fields directly within ->probe(). Both patterns seem
to be used in drivers/gpio, with the latter one being slightly more
common.

Thierry

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