From 125eef96f6cfadddbac8f6b9fccc9848988e7c6e Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Sun, 3 Feb 2013 01:29:26 +0900 Subject: [PATCH] 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: Alexandre Courbot Reviewed-by: Linus Walleij Signed-off-by: Grant Likely --- drivers/gpio/gpiolib.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index c1d8f7bdcd8f..5a79cb955d9f 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -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;