[edk2] [PATCH 2/5] MdeModulePkg/UsbMass: Revert "map -r" media change detection fix

[Ruiyu Ni]

This reverts commit a662afb5b023a187ef638d3cb0e0c313ad39a7fc.
* MdeModulePkg/UsbStorage: Fix "map -r" cannot detect media change

The above commit fixed the following issue:
When system boots to Shell without CDROM inside USB CDROM drive,
and then user inserts the CDROM with Eltorito file system,
"map -r" cannot show the new ELtorito file system.
The commit caused EFI_MEDIA_CHANGED status returned from
UsbBootDetectMedia().

But that fix exposes another issue:
When issuing ReadCapacity command to certain USB key
(Kingston DataTraveler G3 8GB) after it's hot-plugged, USB device
returns STALL error and RequestSense command returns media changed
sense data. (Most of the USB keys return SUCCESS for ReadCapacity
command after hot-plug.)

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu...@intel.com>
Cc: Star Zeng <star.z...@intel.com>
---
 MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c 
b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
index 613008bde7..a8b6a1c5f1 100644
--- a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
+++ b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassBoot.c
@@ -2,7 +2,7 @@
   Implementation 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
@@ -630,10 +630,8 @@ UsbBootGetParams (
 {
   EFI_BLOCK_IO_MEDIA          *Media;
   EFI_STATUS                  Status;
-  UINT8                       CmdSet;
 
   Media  = &(UsbMass->BlockIoMedia);
-  CmdSet = ((EFI_USB_INTERFACE_DESCRIPTOR *) 
(UsbMass->Context))->InterfaceSubClass;
 
   Status = UsbBootInquiry (UsbMass);
   if (EFI_ERROR (Status)) {
@@ -668,18 +666,9 @@ UsbBootGetParams (
     Media->BlockSize        = 0x0800;
   }
 
-  if ((UsbMass->Pdt != USB_PDT_CDROM) && (CmdSet == USB_MASS_STORE_SCSI)) {
-    //
-    // ModeSense is required for the device with PDT of 0x00/0x07/0x0E,
-    // which is from [MassStorageBootabilitySpec-Page7].
-    // ModeSense(10) is useless here, while ModeSense(6) defined in SCSI
-    // could get the information of WriteProtected.
-    // Since not all device support this command, so skip if fail.
-    //
-    UsbScsiModeSense (UsbMass);
-  }
+  Status = UsbBootDetectMedia (UsbMass);
 
-  return UsbBootReadCapacity (UsbMass);
+  return Status;
 }
 
 
@@ -710,7 +699,7 @@ UsbBootDetectMedia (
   CmdSet = ((EFI_USB_INTERFACE_DESCRIPTOR *) 
(UsbMass->Context))->InterfaceSubClass;
 
   Status = UsbBootIsUnitReady (UsbMass);
-  if (EFI_ERROR (Status)) {
+  if (EFI_ERROR (Status) && (Status != EFI_MEDIA_CHANGED)) {
     goto ON_ERROR;
   }
 
-- 
2.16.1.windows.1

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