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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>
This commit is contained in:
Alexandre Courbot 2013-02-03 01:29:26 +09:00 committed by Grant Likely
parent 65493e3ac4
commit 125eef96f6
1 changed files with 7 additions and 10 deletions
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17
drivers/gpio/gpiolib.c
View File

@ -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;