gpiolib: use gpiochip_get_desc() in lineevent_create()

Unduplicate the ngpio check by simply calling gpiochip_get_desc() and
checking its return value.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 166160c..a11c4ee 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1009,8 +1009,9 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
        lflags = eventreq.handleflags;
        eflags = eventreq.eventflags;
 
-       if (offset >= gdev->ngpio)
-               return -EINVAL;
+       desc = gpiochip_get_desc(gdev->chip, offset);
+       if (IS_ERR(desc))
+               return PTR_ERR(desc);
 
        /* Return an error if a unknown flag is set */
        if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
@@ -1048,7 +1049,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
                }
        }
 
-       desc = &gdev->descs[offset];
        ret = gpiod_request(desc, le->label);
        if (ret)
                goto out_free_label;