[PATCH 5/8] gpiolib: use gpiochip_get_desc() in lineevent_create()

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

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

Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
---
 drivers/gpio/gpiolib.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6ef55cc1188b..17796437d7be 100644
--- 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;
-- 
2.23.0