Reviewed-by: Jaben Carsey <jaben.car...@intel.com>

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of
> Cinnamon Shia
> Sent: Thursday, April 28, 2016 7:42 PM
> To: edk2-devel@lists.01.org
> Cc: Carsey, Jaben <jaben.car...@intel.com>; Qiu, Shumin
> <shumin....@intel.com>; Zeng, Star <star.z...@intel.com>
> Subject: [edk2] [PATCH 1/2] ShellPkg/UefiDpLib: Fix the error message "Timer
> library instance error!"
> Importance: High
> 
> When executing shell dp command, there is an error message "Timer library
> instance error!"
> 
> The error message "Timer library instance error!" should be for the case
> about
> duration > EndTimeStamp if CountUp or duration < StartTimeStamp if
> CountDown.
> 
> But if the EndTimeStamp of an entry is not added, it should not the case to
> catch.
> 
> This change fixes the error message "Timer library instance error!" from the
> "BdsAttempt" entry which is logged when trying to boot a boot option.
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Cinnamon Shia <cinnamon.s...@hpe.com>
> ---
>  ShellPkg/Library/UefiDpLib/DpUtilities.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/ShellPkg/Library/UefiDpLib/DpUtilities.c
> b/ShellPkg/Library/UefiDpLib/DpUtilities.c
> index 032e7b4..fbdd938 100644
> --- a/ShellPkg/Library/UefiDpLib/DpUtilities.c
> +++ b/ShellPkg/Library/UefiDpLib/DpUtilities.c
> @@ -2,7 +2,7 @@
>    Utility functions used by the Dp application.
> 
>    Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.
> -  (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
> +  (C) Copyright 2015-2016 Hewlett Packard Enterprise Development LP<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
> @@ -68,6 +68,10 @@ GetDuration (
>    UINT64    Duration;
>    BOOLEAN   Error;
> 
> +  if (Measurement->EndTimeStamp == 0) {
> +    return 0;
> +  }
> +
>    // PERF_START macros are called with a value of 1 to indicate
>    // the beginning of time.  So, adjust the start ticker value
>    // to the real beginning of time.
> --
> 2.8.1.windows.1
> 
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