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 <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 2c457e6..e8f8a19 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) {