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 <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c1d8f7b..5a79cb9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1195,20 +1195,17 @@
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;
