The SerialIo->GetControl() function is not required to set the
Control output parameter on error. Make sure we apply the
EFI_SERIAL_INPUT_BUFFER_EMPTY optimization in
TerminalConInTimerHandler() only if the SerialIo->GetControl()
function call set that bit in the Control variable.
Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <liming....@intel.com>
Cc: Feng Tian <feng.t...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Suggested-by: Laszlo Ersek <ler...@redhat.com>
Signed-off-by: Star Zeng <star.z...@intel.com>
---
MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c
b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c
index c216ed9..3be877b 100644
--- a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c
+++ b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c
@@ -2,7 +2,7 @@
Implementation for EFI_SIMPLE_TEXT_INPUT_PROTOCOL protocol.
(C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
-Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2015, Intel Corporation. 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 full text of the license may be
found at
@@ -562,10 +562,11 @@ TerminalConInTimerHandler (
}
//
// Check whether serial buffer is empty.
+ // Skip the key transfer loop only if the SerialIo protocol instance
+ // successfully reports EFI_SERIAL_INPUT_BUFFER_EMPTY.
//
Status = SerialIo->GetControl (SerialIo, &Control);
-
- if ((Control & EFI_SERIAL_INPUT_BUFFER_EMPTY) == 0) {
+ if (EFI_ERROR (Status) || ((Control & EFI_SERIAL_INPUT_BUFFER_EMPTY) == 0)) {
//
// Fetch all the keys in the serial buffer,
// and insert the byte stream into RawFIFO.
--
1.9.5.msysgit.0
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