leds: trigger: gpio: Avoid warning on update of inverted

If the GPIO has not been configured yet, writing to inverted will raise
a kernel warning.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index dc64679b1a9243c9219f8070de9ce6f5cc396d25..0120faa3dafa644f61d94d544b47400c5f4744c2 100644 (file)
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -99,7 +99,8 @@ static ssize_t gpio_trig_inverted_store(struct device *dev,
        gpio_data->inverted = inverted;
 
        /* After inverting, we need to update the LED. */
-       gpio_trig_irq(0, led);
+       if (gpio_is_valid(gpio_data->gpio))
+               gpio_trig_irq(0, led);
 
        return n;
 }