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 <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

parent 3b711e07

drivers/gpio/gpiolib.c

+12 −3

Original line number	Diff line number	Diff line
		@@ -2005,7 +2005,16 @@ int gpiod_to_irq(const struct gpio_desc *desc)
		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);