diff options
Diffstat (limited to 'drivers/leds/ledtrig-gpio.c')
| -rw-r--r-- | drivers/leds/ledtrig-gpio.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/leds/ledtrig-gpio.c b/drivers/leds/ledtrig-gpio.c index a247ae63374..8183b81fca8 100644 --- a/drivers/leds/ledtrig-gpio.c +++ b/drivers/leds/ledtrig-gpio.c @@ -146,20 +146,26 @@ static ssize_t gpio_trig_gpio_store(struct device *dev, return -EINVAL; } + if (gpio_data->gpio == gpio) + return n; + if (!gpio) { - free_irq(gpio_to_irq(gpio_data->gpio), led); + if (gpio_data->gpio != 0) + free_irq(gpio_to_irq(gpio_data->gpio), led); + gpio_data->gpio = 0; return n; } - if (gpio_data->gpio > 0 && gpio_data->gpio != gpio) - free_irq(gpio_to_irq(gpio_data->gpio), led); - - gpio_data->gpio = gpio; ret = request_irq(gpio_to_irq(gpio), gpio_trig_irq, IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "ledtrig-gpio", led); - if (ret) + if (ret) { dev_err(dev, "request_irq failed with error %d\n", ret); + } else { + if (gpio_data->gpio != 0) + free_irq(gpio_to_irq(gpio_data->gpio), led); + gpio_data->gpio = gpio; + } return ret ? ret : n; } @@ -211,7 +217,8 @@ static void gpio_trig_deactivate(struct led_classdev *led) device_remove_file(led->dev, &dev_attr_inverted); device_remove_file(led->dev, &dev_attr_desired_brightness); flush_work(&gpio_data->work); - free_irq(gpio_to_irq(gpio_data->gpio),led); + if (gpio_data->gpio != 0) + free_irq(gpio_to_irq(gpio_data->gpio), led); kfree(gpio_data); } } |