From 3789f5acb9bbe088f70779002f32e7c6a64000bc Mon Sep 17 00:00:00 2001 From: Biju Das Date: Tue, 7 Aug 2018 08:15:18 +0100 Subject: [PATCH] gpiolib: Avoid calling chip->request() for unused gpios Add a check for unused gpios to avoid chip->request() call to client driver for unused gpios. Signed-off-by: Biju Das Reviewed-by: Fabrizio Castro Reviewed-by: Geert Uytterhoeven Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 2c457e604403..e8f8a1999393 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2267,6 +2267,7 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) struct gpio_chip *chip = desc->gdev->chip; int status; unsigned long flags; + unsigned offset; spin_lock_irqsave(&gpio_lock, flags); @@ -2285,7 +2286,11 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label) if (chip->request) { /* chip->request may sleep */ spin_unlock_irqrestore(&gpio_lock, flags); - status = chip->request(chip, gpio_chip_hwgpio(desc)); + offset = gpio_chip_hwgpio(desc); + if (gpiochip_line_is_valid(chip, offset)) + status = chip->request(chip, offset); + else + status = -EINVAL; spin_lock_irqsave(&gpio_lock, flags); if (status < 0) { -- 2.30.2