diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index fe1b385deecc..b2b26dc25051 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -887,15 +887,16 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) hwgpio = gpio_chip_hwgpio(desc); - if (test_bit(hwgpio, cdev->watched_lines)) + if (test_and_set_bit(hwgpio, cdev->watched_lines)) return -EBUSY; gpio_desc_to_lineinfo(desc, &lineinfo); - if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) + if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) { + clear_bit(hwgpio, cdev->watched_lines); return -EFAULT; + } - set_bit(hwgpio, cdev->watched_lines); return 0; } else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) { if (copy_from_user(&offset, ip, sizeof(offset))) @@ -907,10 +908,9 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg) hwgpio = gpio_chip_hwgpio(desc); - if (!test_bit(hwgpio, cdev->watched_lines)) + if (!test_and_clear_bit(hwgpio, cdev->watched_lines)) return -EBUSY; - clear_bit(hwgpio, cdev->watched_lines); return 0; } return -EINVAL; |