From 010bb3d2dbb3d91512102ee3f3a4a160835e308a Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 3 Jun 2011 09:14:16 +0000
Subject: EmbeddedPkg/SerialDxe: Only read Serial Port if data available

Poll the Serial Port to ensure data are available.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11730 6f19259b-4bc3-4df7-8a09-765794883524
---
 EmbeddedPkg/SerialDxe/SerialIo.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'EmbeddedPkg')

diff --git a/EmbeddedPkg/SerialDxe/SerialIo.c b/EmbeddedPkg/SerialDxe/SerialIo.c
index 612543be14..b9ea4b9c42 100644
--- a/EmbeddedPkg/SerialDxe/SerialIo.c
+++ b/EmbeddedPkg/SerialDxe/SerialIo.c
@@ -188,10 +188,12 @@ SerialRead (
   OUT VOID                   *Buffer
   )
 {
-  UINTN Count;
+  UINTN Count = 0;
   
-  Count = SerialPortRead (Buffer, *BufferSize);
-  *BufferSize = Count;
+  if (SerialPortPoll()) {
+    Count = SerialPortRead (Buffer, *BufferSize);
+    *BufferSize = Count;
+  }
   return (Count == 0) ? EFI_DEVICE_ERROR : EFI_SUCCESS;
 }
 
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