[patch 1/3] EmbeddedPkg/VirtualKeyboard: Avoid notification called more than once

[dandan bi <dandan.bi@intel.com>]

From: Dandan Bi <dandan.bi@intel.com>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=996

Issue:
In current code logic, when a key is pressed, it will search
the whole NotifyList to find whether a notification has been
registered with the keystroke. if yes, it will en-queue the
key for notification execution later. And now if different
notification functions have been registered with the same key,
then the key will be en-queued more than once. Then it will
cause the notification executed more than once.

This patch is to enhance the code logic to fix this issue.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c
index 6609bc8dbe..daea9c47d2 100644
--- a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c
@@ -1,9 +1,9 @@
 /** @file
   VirtualKeyboard driver
 
-Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
 Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
 
 This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The
@@ -1043,10 +1043,11 @@ VirtualKeyboardTimerHandler (
       // while current TPL is TPL_NOTIFY. It will be invoked in
       // KeyNotifyProcessHandler() which runs at TPL_CALLBACK.
       //
       Enqueue (&VirtualKeyboardPrivate->QueueForNotify, &KeyData);
       gBS->SignalEvent (VirtualKeyboardPrivate->KeyNotifyProcessEvent);
+      break;
     }
   }
 
   Enqueue (&VirtualKeyboardPrivate->Queue, &KeyData);
 
-- 
2.14.3.windows.1