leds-gpio: fix possible crash on OF device unbinding

If there are leds present in the OF tree, but the GPIOs for (some) of
them are unavailable, led_data doesn't get populated with correct
devices. Then, on device unbinding, one can crash the kernel.

Workaround this by setting led->gpio to invalid value early.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 7467980..e5225d2 100644 (file)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -78,6 +78,8 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
 {
        int ret, state;
 
+       led_dat->gpio = -1;
+
        /* skip leds that aren't available */
        if (!gpio_is_valid(template->gpio)) {
                printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",