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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 7467980b8cf9..e5225d28f392 100644
--- 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",