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authorAlexandre Courbot <acourbot@nvidia.com>2013-02-03 01:29:26 +0900
committerGrant Likely <grant.likely@secretlab.ca>2013-02-09 09:23:30 +0000
commit125eef96f6cfadddbac8f6b9fccc9848988e7c6e (patch)
tree70c2cf06b32ba24460df717381a4f53e63401afc /drivers/gpio
parent65493e3ac429623df021e0859d97691f4b42615a (diff)
downloadlinux-125eef96f6cfadddbac8f6b9fccc9848988e7c6e.tar.bz2
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c17
1 files 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;