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Commit 125eef96 authored by Alexandre Courbot's avatar Alexandre Courbot Committed by Grant Likely
Browse files

gpiolib: use gpio_chips list in gpiochip_find 



Using the GPIO chips list is much faster than parsing the entire GPIO
number space.

Signed-off-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 65493e3a

drivers/gpio/gpiolib.c

+7 −10
Original line number Diff line number Diff line
@@ -1195,20 +1195,17 @@ struct gpio_chip *gpiochip_find(void *data, 
				int (*match)(struct gpio_chip *chip,

					     void *data))

{

	struct gpio_chip *chip = NULL;

	struct gpio_chip *chip;

	unsigned long flags;

	int i;



	spin_lock_irqsave(&gpio_lock, flags);

	for (i = 0; i < ARCH_NR_GPIOS; i++) {

		if (!gpio_desc[i].chip)

			continue;



		if (match(gpio_desc[i].chip, data)) {

			chip = gpio_desc[i].chip;

	list_for_each_entry(chip, &gpio_chips, list)

		if (match(chip, data))

			break;

		}

	}



	/* No match? */

	if (&chip->list == &gpio_chips)

		chip = NULL;

	spin_unlock_irqrestore(&gpio_lock, flags);



	return chip;