gpiolib: use gpiochip_get_desc() in gpio_ioctl()

Unduplicate the offset 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 a11c4ee..5eef7dd 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1175,10 +1175,11 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 
                if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
                        return -EFAULT;
-               if (lineinfo.line_offset >= gdev->ngpio)
-                       return -EINVAL;
 
-               desc = &gdev->descs[lineinfo.line_offset];
+               desc = gpiochip_get_desc(chip, lineinfo.line_offset);
+               if (IS_ERR(desc))
+                       return PTR_ERR(desc);
+
                if (desc->name) {
                        strncpy(lineinfo.name, desc->name,
                                sizeof(lineinfo.name));