MdeModulePkg/RamDiskDxe: Perform MediaId check first in BlkIo services

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: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

1 files changed, 15 insertions, 15 deletions

diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskBlockIo.c
index f36e1c8..4f74b5e 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;

   }