The functions ScsiDiskWriteBlocks(Ex) in ScsiDiskDxe/ScsiDisk.c do not check whether the device is allow to be written originally. This commit will add read-only check to follow the UEFI spec. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19445 6f19259b-4bc3-4df7-8a09-765794883524