[GIT PULL REQUEST] late md/raid1 bug fixes for 3.17

Hi Linus, it is amazing how much easier it is to find bugs when you know one is there. Two bug reports resulted in finding 7 bugs!! All are tagged for -stable. Those that can't cause (rare) data corruption, cause lockups. Thanks, NeilBrown The following changes since commit

[GIT PULL REQUEST] late md/raid1 bug fixes for 3.17

Hi Linus, it is amazing how much easier it is to find bugs when you know one is there. Two bug reports resulted in finding 7 bugs!! All are tagged for -stable. Those that can't cause (rare) data corruption, cause lockups. Thanks, NeilBrown The following changes since commit