The commit places the check for MediaId at the beginning of Block IO
services:
RamDiskBlkIoReadBlocks and
RamDiskBlkIoWriteBlocks

This aligns with the Block IO protocol implementations for other
devices.

Cc: Ruiyu Ni <ruiyu...@intel.com>
Cc: Star Zeng <star.z...@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a...@intel.com>
---
 .../Universal/Disk/RamDiskDxe/RamDiskBlockIo.c     | 30 +++++++++++-----------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c 
b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c
index f36e1c8ff2..4f74b5ef15 100644
--- a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c
+++ b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c
@@ -1,7 +1,7 @@
 /** @file
   Produce EFI_BLOCK_IO_PROTOCOL on a RAM disk device.
 
-  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2016 - 2018, 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
@@ -137,6 +137,12 @@ RamDiskBlkIoReadBlocks (
   RAM_DISK_PRIVATE_DATA           *PrivateData;
   UINTN                           NumberOfBlocks;
 
+  PrivateData = RAM_DISK_PRIVATE_FROM_BLKIO (This);
+
+  if (MediaId != PrivateData->Media.MediaId) {
+    return EFI_MEDIA_CHANGED;
+  }
+
   if (Buffer == NULL) {
     return EFI_INVALID_PARAMETER;
   }
@@ -145,12 +151,6 @@ RamDiskBlkIoReadBlocks (
     return EFI_SUCCESS;
   }
 
-  PrivateData = RAM_DISK_PRIVATE_FROM_BLKIO (This);
-
-  if (MediaId != PrivateData->Media.MediaId) {
-    return EFI_MEDIA_CHANGED;
-  }
-
   if ((BufferSize % PrivateData->Media.BlockSize) != 0) {
     return EFI_BAD_BUFFER_SIZE;
   }
@@ -212,14 +212,6 @@ RamDiskBlkIoWriteBlocks (
   RAM_DISK_PRIVATE_DATA           *PrivateData;
   UINTN                           NumberOfBlocks;
 
-  if (Buffer == NULL) {
-    return EFI_INVALID_PARAMETER;
-  }
-
-  if (BufferSize == 0) {
-    return EFI_SUCCESS;
-  }
-
   PrivateData = RAM_DISK_PRIVATE_FROM_BLKIO (This);
 
   if (MediaId != PrivateData->Media.MediaId) {
@@ -230,6 +222,14 @@ RamDiskBlkIoWriteBlocks (
     return EFI_WRITE_PROTECTED;
   }
 
+  if (Buffer == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (BufferSize == 0) {
+    return EFI_SUCCESS;
+  }
+
   if ((BufferSize % PrivateData->Media.BlockSize) != 0) {
     return EFI_BAD_BUFFER_SIZE;
   }
-- 
2.12.0.windows.1

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