linux-kernel - Re: [patch 2.6.24-rc6-mm 2/9] gpiolib: add gpio provider infrastructure

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Date:	Sat, 29 Dec 2007 08:10:23 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	eric miao <eric.y.miao@...il.com>
Subject: Re: [patch 2.6.24-rc6-mm 2/9] gpiolib: add gpio provider infrastructure

Hi David.

> +/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
> + * when setting direction, and otherwise illegal.  Until board setup code
> + * and drivers use explicit requests everywhere (which won't happen when
> + * those calls have no teeth) we can't avoid autorequesting.  This nag
> + * message should motivate switching to explicit requests...
> + */
> +static void gpio_ensure_requested(struct gpio_desc *desc)
> +{
> +	if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
> +		pr_warning("GPIO-%d autorequested\n", (int)(desc - gpio_desc));
> +#ifdef CONFIG_DEBUG_FS
> +		desc->label = "[auto]";
> +#endif
> +	}
For this an the other setters of desc->label a small helper function
would be better. The helper function could then contain the necessary
ifdef in only one place.


> --- at91.orig/include/asm-generic/gpio.h
> +++ at91/include/asm-generic/gpio.h
> +
> +extern const char *gpiochip_is_requested(struct gpio_chip *chip,
> +			unsigned offset);
> +
> +/* add/remove chips */
> +extern int gpiochip_add(struct gpio_chip *chip);
> +extern int __must_check gpiochip_remove(struct gpio_chip *chip);

The use of "extern" is not needed in .h files for function prototypes.

	Sam
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