leds: delay led_set_brightness if stopping soft-blink

Delay execution of led_set_brightness() if need to stop soft-blink
timer.

This allows led_set_brightness to be called in hard-irq context even if
soft-blink was activated on that LED.

Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 3aade1d8f410..56761974f282 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -16,6 +16,7 @@
 #include <linux/spinlock.h>
 #include <linux/rwsem.h>
 #include <linux/timer.h>
+#include <linux/workqueue.h>
 
 struct device;
 /*
@@ -69,6 +70,9 @@ struct led_classdev {
         struct timer_list        blink_timer;
         int                      blink_brightness;
 
+        struct work_struct      set_brightness_work;
+        int                     delayed_set_value;
+
 #ifdef CONFIG_LEDS_TRIGGERS
         /* Protects the trigger data below */
         struct rw_semaphore      trigger_lock;