MdeModulePkg/AtaAtapiPassThru: Correct the algo of calculating PRDT number to avoid...

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Tian, Feng <feng.tian@intel.com>
Reviewed-by: Zeng, Star <star.zeng@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15667 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index df22d517fddd93af51d8a3293dcc3578f934daa2..7fc7a2812676bcace176849a87558d2c20e41a0b 100644 (file)
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -1,7 +1,7 @@
 /** @file\r
   The file for AHCI mode of ATA host controller.\r
 \r
-  Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>\r
   This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
@@ -532,7 +532,7 @@ AhciBuildCommand (
   //\r
   // Filling the PRDT\r
   //\r
-  PrdtNumber = (DataLength + EFI_AHCI_MAX_DATA_PER_PRDT - 1) / EFI_AHCI_MAX_DATA_PER_PRDT;\r
+  PrdtNumber = (UINT32)DivU64x32 (((UINT64)DataLength + EFI_AHCI_MAX_DATA_PER_PRDT - 1), EFI_AHCI_MAX_DATA_PER_PRDT);\r
 \r
   //\r
   // According to AHCI 1.3 spec, a PRDT entry can point to a maximum 4MB data block.\r