From mboxrd@z Thu Jan 1 00:00:00 1970 From: acourbot@nvidia.com (Alexandre Courbot) Date: Sun, 3 Feb 2013 01:29:26 +0900 Subject: [PATCH 3/9] gpiolib: use gpio_chips list in gpiochip_find In-Reply-To: <1359822572-26009-1-git-send-email-acourbot@nvidia.com> References: <1359822572-26009-1-git-send-email-acourbot@nvidia.com> Message-ID: <1359822572-26009-5-git-send-email-acourbot@nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Using the GPIO chips list is much faster than parsing the entire GPIO number space. Signed-off-by: Alexandre Courbot --- 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 4ceb4a7..92f9ee4 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1194,20 +1194,17 @@ 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; -- 1.8.1.1