1 files changed, 26 insertions, 14 deletions

diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index be1fe46cd308..9e80012d0d0c 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -219,7 +219,8 @@ struct atkbd {
         unsigned long time;
         unsigned long err_count;
 
-        struct work_struct event_work;
+        struct delayed_work event_work;
+        unsigned long event_jiffies;
         struct mutex event_mutex;
         unsigned long event_mask;
 };
@@ -565,7 +566,7 @@ static int atkbd_set_leds(struct atkbd *atkbd)
 
 static void atkbd_event_work(struct work_struct *work)
 {
-        struct atkbd *atkbd = container_of(work, struct atkbd, event_work);
+        struct atkbd *atkbd = container_of(work, struct atkbd, event_work.work);
 
         mutex_lock(&atkbd->event_mutex);
 
@@ -579,12 +580,30 @@ static void atkbd_event_work(struct work_struct *work)
 }
 
 /*
+ * Schedule switch for execution. We need to throttle requests,
+ * otherwise keyboard may become unresponsive.
+ */
+static void atkbd_schedule_event_work(struct atkbd *atkbd, int event_bit)
+{
+        unsigned long delay = msecs_to_jiffies(50);
+
+        if (time_after(jiffies, atkbd->event_jiffies + delay))
+                delay = 0;
+
+        atkbd->event_jiffies = jiffies;
+        set_bit(event_bit, &atkbd->event_mask);
+        wmb();
+        schedule_delayed_work(&atkbd->event_work, delay);
+}
+
+/*
  * Event callback from the input module. Events that change the state of
  * the hardware are processed here. If action can not be performed in
  * interrupt context it is offloaded to atkbd_event_work.
  */
 
-static int atkbd_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+static int atkbd_event(struct input_dev *dev,
+                        unsigned int type, unsigned int code, int value)
 {
         struct atkbd *atkbd = input_get_drvdata(dev);
 
@@ -594,19 +613,12 @@ static int atkbd_event(struct input_dev *dev, unsigned int type, unsigned int co
         switch (type) {
 
                 case EV_LED:
-                        set_bit(ATKBD_LED_EVENT_BIT, &atkbd->event_mask);
-                        wmb();
-                        schedule_work(&atkbd->event_work);
+                        atkbd_schedule_event_work(atkbd, ATKBD_LED_EVENT_BIT);
                         return 0;
 
                 case EV_REP:
-
-                        if (!atkbd->softrepeat) {
-                                set_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask);
-                                wmb();
-                                schedule_work(&atkbd->event_work);
-                        }
-
+                        if (!atkbd->softrepeat)
+                                atkbd_schedule_event_work(atkbd, ATKBD_REP_EVENT_BIT);
                         return 0;
         }
 
@@ -940,7 +952,7 @@ static int atkbd_connect(struct serio *serio, struct serio_driver *drv)
 
         atkbd->dev = dev;
         ps2_init(&atkbd->ps2dev, serio);
-        INIT_WORK(&atkbd->event_work, atkbd_event_work);
+        INIT_DELAYED_WORK(&atkbd->event_work, atkbd_event_work);
         mutex_init(&atkbd->event_mutex);
 
         switch (serio->id.type) {