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The DRQReady() and DRQReady2() functions only differ in that they poll different status registers for BSY, ERR, and DRQ: the former looks at the Status Register (clearing interrupt status), while the latter looks at the Alternate Status Register (not clearing interrupt status). They both correctly return a unique status code, EFI_NOT_READY, for the BSY==0 && ERR==0 && DRQ==0 case; that is, when the device reports "command complete". However, the functions' leading comments don't explain this case, so it's easy to miss in callers. Update the comments. Cc: Feng Tian <feng.tian@intel.com> Cc: Star Zeng <star.zeng@intel.com> Cc: John Snow <jsnow@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Feng Tian <feng.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19684 6f19259b-4bc3-4df7-8a09-765794883524