When ShellLib is linked to a driver producing DynamicCommand
protocol, ShellParameters protocol is set by
DynamicCommand.Handler().
The driver image handle doesn't have ShellParameters protocol
installed.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
---
 ShellPkg/Library/UefiShellLib/UefiShellLib.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/ShellPkg/Library/UefiShellLib/UefiShellLib.c b/ShellPkg/Library/UefiShellLib/UefiShellLib.c
index 677791c67f..00f58ca0c1 100644
--- a/ShellPkg/Library/UefiShellLib/UefiShellLib.c
+++ b/ShellPkg/Library/UefiShellLib/UefiShellLib.c
@@ -215,7 +215,7 @@ ShellLibConstructorWorker (
     gEfiShellParametersProtocol = NULL;
   }
 
-  if (gEfiShellParametersProtocol == NULL || gEfiShellProtocol == NULL) {
+  if (gEfiShellProtocol == NULL) {
     //
     // Moved to seperate function due to complexity
     //
@@ -238,10 +238,14 @@ ShellLibConstructorWorker (
   }
 
   //
-  // only success getting 2 of either the old or new, but no 1/2 and 1/2
+  // Getting either EDK Shell's ShellEnvironment2 and ShellInterface protocol
+  //  or UEFI Shell's Shell protocol.
+  // When ShellLib is linked to a driver producing DynamicCommand protocol,
+  //  ShellParameters protocol is set by DynamicCommand.Handler().
   //
-  if ((mEfiShellEnvironment2 != NULL && mEfiShellInterface          != NULL) ||
-      (gEfiShellProtocol     != NULL && gEfiShellParametersProtocol != NULL)   ) {
+  if ((mEfiShellEnvironment2 != NULL && mEfiShellInterface != NULL) ||
+      (gEfiShellProtocol     != NULL)
+      ) {
     if (gEfiShellProtocol != NULL) {
       FileFunctionMap.GetFileInfo     = gEfiShellProtocol->GetFileInfo;
       FileFunctionMap.SetFileInfo     = gEfiShellProtocol->SetFileInfo;
-- 
2.15.0.gvfs.1.preview.4

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