From bc19591807481c898bd7126bc5badfaab698722b Mon Sep 17 00:00:00 2001
From: Hao Wu <hao.a.wu@intel.com>
Date: Tue, 5 May 2015 02:34:20 +0000
Subject: IntelFrameworkModulePkg: Modify IsaSerialDxe to follow driver rules

IsaSerialDxe creates child handles and wishes to retrieve the name for
those child controllers.

However, in the IsaSerialComponentNameGetControllerName() function, it
directly return EFI_UNSUPPORTED when ChildHandle != NULL.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17289 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Bus/Isa/IsaSerialDxe/ComponentName.c           | 64 +++++++++++++---------
 1 file changed, 37 insertions(+), 27 deletions(-)

diff --git a/IntelFrameworkModulePkg/Bus/Isa/IsaSerialDxe/ComponentName.c b/IntelFrameworkModulePkg/Bus/Isa/IsaSerialDxe/ComponentName.c
index 4b17c5423c..ef24008f6b 100644
--- a/IntelFrameworkModulePkg/Bus/Isa/IsaSerialDxe/ComponentName.c
+++ b/IntelFrameworkModulePkg/Bus/Isa/IsaSerialDxe/ComponentName.c
@@ -180,16 +180,11 @@ IsaSerialComponentNameGetControllerName (
   OUT CHAR16                                          **ControllerName
   )
 {
-  EFI_STATUS              Status;
-  EFI_SERIAL_IO_PROTOCOL  *SerialIo;
-  SERIAL_DEV              *SerialDevice;
+  EFI_STATUS                Status;
+  EFI_SERIAL_IO_PROTOCOL    *SerialIo;
+  SERIAL_DEV                *SerialDevice;
+  EFI_UNICODE_STRING_TABLE  *ControllerNameTable;
 
-  //
-  // This is a device driver, so ChildHandle must be NULL.
-  //
-  if (ChildHandle != NULL) {
-    return EFI_UNSUPPORTED;
-  }
   //
   // Make sure this driver is currently managing ControllerHandle
   //
@@ -201,29 +196,44 @@ IsaSerialComponentNameGetControllerName (
   if (EFI_ERROR (Status)) {
     return Status;
   }
-  //
-  // Get the Block I/O Protocol on Controller
-  //
-  Status = gBS->OpenProtocol (
-                  ControllerHandle,
-                  &gEfiSerialIoProtocolGuid,
-                  (VOID **) &SerialIo,
-                  gSerialControllerDriver.DriverBindingHandle,
-                  ControllerHandle,
-                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
-                  );
-  if (EFI_ERROR (Status)) {
-    return Status;
+
+  ControllerNameTable = NULL;
+  if (ChildHandle != NULL) {
+    Status = EfiTestChildHandle (
+               ControllerHandle,
+               ChildHandle,
+               &gEfiIsaIoProtocolGuid
+               );
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    //
+    // Get the Serial I/O Protocol from the child handle
+    //
+    Status = gBS->OpenProtocol (
+                    ChildHandle,
+                    &gEfiSerialIoProtocolGuid,
+                    (VOID **) &SerialIo,
+                    gSerialControllerDriver.DriverBindingHandle,
+                    ChildHandle,
+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                    );
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    //
+    // Get the Serial Controller's Device structure
+    //
+    SerialDevice = SERIAL_DEV_FROM_THIS (SerialIo);
+    ControllerNameTable = SerialDevice->ControllerNameTable;
   }
-  //
-  // Get the Serial Controller's Device structure
-  //
-  SerialDevice = SERIAL_DEV_FROM_THIS (SerialIo);
 
   return LookupUnicodeString2 (
            Language,
            This->SupportedLanguages,
-           SerialDevice->ControllerNameTable,
+           ControllerNameTable,
            ControllerName,
            (BOOLEAN)(This == &gIsaSerialComponentName)
            );
-- 
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