This reverts commit 6461344c318cd43a5494c0302e142a0cbe386d52.
* MdeModulePkg/UsbMass: Fix hot-plug USB CDROM can't be recognized

UsbBootExecCmd() only calls UsbBootRequestSense() to get sense key
when CMD fails.
When POWER ON (29h) ASC returns from REQUEST SENSE, implementation
should retry the CMD, instead of treating this as a SUCCESS.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
---
 MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c | 2 --
 MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.h | 3 +--
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
index 12e68d2149..613008bde7 100644
--- a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
+++ b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
@@ -124,8 +124,6 @@ UsbBootRequestSense (
       Status = EFI_NOT_READY;
     } else if (SenseData.Asc == USB_BOOT_ASC_NO_MEDIA) {
       Status = EFI_NOT_READY;
-    } else if (SenseData.Asc == USB_BOOT_ASC_POWER_ON) {
-      Status = EFI_SUCCESS;
     }
     break;
 
diff --git a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.h b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.h
index 5ee50ac52a..13a926035c 100644
--- a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.h
+++ b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.h
@@ -2,7 +2,7 @@
   Definition of the command set of USB Mass Storage Specification
   for Bootability, Revision 1.0.
 
-Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 2017, 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
@@ -55,7 +55,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define USB_BOOT_ASC_NOT_READY                        0x04
 #define USB_BOOT_ASC_NO_MEDIA                         0x3A
 #define USB_BOOT_ASC_MEDIA_CHANGE                     0x28
-#define USB_BOOT_ASC_POWER_ON                         0x29
 
 //
 // Supported PDT codes, or Peripheral Device Type
-- 
2.16.1.windows.1

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