diff mbox series

[v4,06/13] gpiolib: use gpiochip_get_desc() in gpio_ioctl()

Message ID 20191224120709.18247-7-brgl@bgdev.pl
State New
Headers show
Series gpiolib: add an ioctl() for monitoring line status changes | expand

Commit Message

Bartosz Golaszewski Dec. 24, 2019, 12:07 p.m. UTC 
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

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>
---
 drivers/gpio/gpiolib.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Comments

Linus Walleij Jan. 7, 2020, 10:04 a.m. UTC | #1 
On Tue, Dec 24, 2019 at 1:07 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> 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>

Yours,
Linus Walleij
diff mbox series

Patch

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 007f16fdf782..81d5eda4de7d 100644
--- 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));