AtaBusDxe: Fix ReadBlockEx andWriteBlockEx to still signal event when the BufferSize is 0.

DiskIoDxe: Fix ReadDiskEx and WriteDiskEx to not modify the user’s buffer when the BufferSize is 0.
DiskIoDxe: Fix ReadDiskEx and WriteDiskEx hang issue when the submitted blockio2 task is completed before submitting another blockio2 task.
DiskIoDxe: Fix FlushEx to free the flush task item in callback (memory leak issue).

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16215 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Disk/DiskIoDxe/DiskIo.h

@@ -51,6 +51,7 @@ typedef struct {
 typedef struct {
   UINT32                          Signature;
   LIST_ENTRY                      Link;     /// < link to other task
+  EFI_LOCK                        SubtasksLock;
   LIST_ENTRY                      Subtasks; /// < header of subtasks
   EFI_DISK_IO2_TOKEN              *Token;
   DISK_IO_PRIVATE_DATA            *Instance;