From e93545763021988def06fbda28fe5da133589a96 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 9 Jul 2012 12:22:56 +0100 Subject: gpiolib: Defer failed gpio requests by default Since users must be explicitly provided with a GPIO number in order to request one the overwhelmingly common case for failing to request will be that the required GPIO driver has not yet registered and we should therefore defer until it has registered. In order to avoid having to code this logic in individual drivers have gpio_request() return -EPROBE_DEFER when failing to look up the GPIO. Drivers which don't want this behaviour can override it if they desire. Signed-off-by: Mark Brown Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 120b2a0e3167..de0213c9d11c 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1186,7 +1186,7 @@ int gpio_request(unsigned gpio, const char *label) { struct gpio_desc *desc; struct gpio_chip *chip; - int status = -EINVAL; + int status = -EPROBE_DEFER; unsigned long flags; spin_lock_irqsave(&gpio_lock, flags); -- cgit v1.2.2