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>

1 files changed, 6 insertions, 1 deletions

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) {