From 4c37ce8608a8c6521726d4cd1d4f54424e8d095f Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Mon, 2 May 2016 13:13:10 +0200 Subject: [PATCH] gpio: make gpiod_to_irq() return negative for NO_IRQ If a translation returns zero, that means NO_IRQ, so we should return an error since the function is documented to return a negative code on error. Reported-by: Geert Uytterhoeven Acked-by: Geert Uytterhoeven Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 340b021a3782..a68c6d732818 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1999,13 +1999,22 @@ EXPORT_SYMBOL_GPL(gpiod_cansleep); */ int gpiod_to_irq(const struct gpio_desc *desc) { - struct gpio_chip *chip; - int offset; + struct gpio_chip *chip; + int offset; VALIDATE_DESC(desc); chip = desc->gdev->chip; offset = gpio_chip_hwgpio(desc); - return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; + if (chip->to_irq) { + int retirq = chip->to_irq(chip, offset); + + /* Zero means NO_IRQ */ + if (!retirq) + return -ENXIO; + + return retirq; + } + return -ENXIO; } EXPORT_SYMBOL_GPL(gpiod_to_irq); -- 2.20.1