Input: atkbd - postpone restoring LED/repeat rate at resume

We need to postpone restoring LED state and typematic settings until
keyboard is finished reconnecting upon resume. Normally driver core
and PM infrastructure takes care of proper ordering and dependencies,
but or case actual reconnect is done asynchronously from kseriod.
So while driver core thinks that keyboard was resumed and it is time
to let input core run it's resume handlers in reality keyboard is not
ready yet. The solution is to keep rescheduling work that adjusts LED
and rate settings until keyboard is fully enabled.

Reported-by: Carlos R. Mafra <crmafra2@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index 73b530424729..de520386f13f 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -574,11 +574,22 @@ static void atkbd_event_work(struct work_struct *work)
 
         mutex_lock(&atkbd->event_mutex);
 
-        if (test_and_clear_bit(ATKBD_LED_EVENT_BIT, &atkbd->event_mask))
-                atkbd_set_leds(atkbd);
+        if (!atkbd->enabled) {
+                /*
+                 * Serio ports are resumed asynchronously so while driver core
+                 * thinks that device is already fully operational in reality
+                 * it may not be ready yet. In this case we need to keep
+                 * rescheduling till reconnect completes.
+                 */
+                schedule_delayed_work(&atkbd->event_work,
+                                        msecs_to_jiffies(100));
+        } else {
+                if (test_and_clear_bit(ATKBD_LED_EVENT_BIT, &atkbd->event_mask))
+                        atkbd_set_leds(atkbd);
 
-        if (test_and_clear_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask))
-                atkbd_set_repeat_rate(atkbd);
+                if (test_and_clear_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask))
+                        atkbd_set_repeat_rate(atkbd);
+        }
 
         mutex_unlock(&atkbd->event_mutex);
 }