leds: Document the context brightness_set needs

Make sure there is no confusion about the contexts brightness_set
can be called under by documenting it.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

diff --git a/include/linux/leds.h b/include/linux/leds.h
index ff1570f..519df72 100644 (file)
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -35,6 +35,7 @@ struct led_classdev {
 #define LED_SUSPENDED          (1 << 0)
 
        /* Set LED brightness level */
+       /* Must not sleep, use a workqueue if needed */
        void            (*brightness_set)(struct led_classdev *led_cdev,
                                          enum led_brightness brightness);
        /* Get LED brightness level */