linux-kernel - Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

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Date:	Fri, 13 Sep 2013 20:36:15 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

On Fri, Sep 13, 2013 at 06:55:11PM +0300, Andy Shevchenko wrote:
> On Fri, Sep 13, 2013 at 6:14 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> > GPIO operation regions is a new feature introduced in ACPI 5.0
> > specification. In practise it means that now ASL code can toggle GPIOs with
> > the help of the OS GPIO driver.
> 
> []
> 
> >  void acpi_gpiochip_add(struct gpio_chip *chip)
> >  {
> > +       struct acpi_gpio_chip_data *data;
> > +       acpi_handle handle;
> > +       acpi_status status;
> > +
> > +       handle = ACPI_HANDLE(chip->dev);
> > +       if (!handle)
> > +               return;
> > +
> > +       data = kzalloc(sizeof(*data), GFP_KERNEL);
> 
> May we use devm_kzalloc here?

The ACPI event handling code still uses kzalloc() and we need to call
acpi_gpiolib_remove() anyway (which undoes this), so I think we should
stick with kzalloc() now.
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