This patch adds a new brightness_set_blocking op to the LED subsystem.
The op is intended for drivers that set brightness in a blocking way,
i.e. they either can sleep or use delays while setting brightness.

Signed-off-by: Jacek Anaszewski <j.anaszew...@samsung.com>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Sakari Ailus <sakari.ai...@linux.intel.com>
Cc: Pavel Machek <pa...@ucw.cz>
Cc: Stas Sergeev <s...@users.sourceforge.net>
---
 drivers/leds/led-class.c |    3 +++
 include/linux/leds.h     |    6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index ca51d58..93a2414 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -267,6 +267,9 @@ int led_classdev_register(struct device *parent, struct 
led_classdev *led_cdev)
                dev_warn(parent, "Led %s renamed to %s due to name collision",
                                led_cdev->name, dev_name(led_cdev->dev));
 
+       WARN_ON(led_cdev->brightness_set &&
+               led_cdev->brightness_set_blocking);
+
 #ifdef CONFIG_LEDS_TRIGGERS
        init_rwsem(&led_cdev->trigger_lock);
 #endif
diff --git a/include/linux/leds.h b/include/linux/leds.h
index b122eea..85fad6b 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -54,6 +54,12 @@ struct led_classdev {
        void            (*brightness_set)(struct led_classdev *led_cdev,
                                          enum led_brightness brightness);
        /*
+        * Intended for drivers that either can sleep or use delays while
+        * setting brightness.
+        */
+       int (*brightness_set_blocking)(struct led_classdev *led_cdev,
+                                      enum led_brightness brightness);
+       /*
         * Set LED brightness level immediately - it can block the caller for
         * the time required for accessing a LED device register.
         */
-- 
1.7.9.5

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