linux-kernel - Re: [PATCH 1/2] gpio / ACPI: register to ACPI events automatically

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 23 Sep 2013 13:52:18 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpio / ACPI: register to ACPI events automatically

On Fri, Sep 20, 2013 at 09:08:57PM +0200, Linus Walleij wrote:
> On Fri, Sep 13, 2013 at 5:14 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> 
> > Instead of asking each driver to register to the ACPI events we can just
> > call acpi_gpiochip_register_interrupts() for each chip that has ACPI
> > handle. It checks chip->to_irq and if it is set to NULL (a GPIO driver that
> > doesn't do interrupts) the function does nothing.
> >
> > Also make the event interface to be private to gpiolib-acpi and remove call
> > to the API from the one existing user (pinctrl-baytrail.c).
> >
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> 
> The concept looks sane...
> 
> > +void acpi_gpiochip_add(struct gpio_chip *chip)
> > +{
> > +       acpi_gpiochip_request_interrupts(chip);
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_gpiochip_add);
> > +
> > +void acpi_gpiochip_remove(struct gpio_chip *chip)
> > +{
> > +       acpi_gpiochip_free_interrupts(chip);
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_gpiochip_remove);
> 
> If you're only going to call this from within gpiolib, why are
> you EXPORTing the APIs?
> 
> I think we should maybe create drivers/gpio/gpiolib.h
> for such subsystem-local headers.

Good point. Will do that in the next version.

> > @@ -1221,6 +1222,7 @@ int gpiochip_add(struct gpio_chip *chip)
> >  #endif
> >
> >         of_gpiochip_add(chip);
> > +       acpi_gpiochip_add(chip);
> >
> >         if (status)
> >                 goto fail;
> > @@ -1262,6 +1264,7 @@ int gpiochip_remove(struct gpio_chip *chip)
> >
> >         gpiochip_remove_pin_ranges(chip);
> >         of_gpiochip_remove(chip);
> > +       acpi_gpiochip_remove(chip);
> 
> What happens on a platform that is not using CONFIG_GPIO_ACPI
> when they try to compile this?
> 
> You forgot to add static inline stubs for the non-ACPI case.

This patch adds them to <linux/acpi_gpio.h> which is included from
gpiolib.c.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/