md: Always set RECOVERY_NEEDED when clearing RECOVERY_FROZEN
commit 45eaf45d upstream. md_check_recovery will skip any recovery and also clear MD_RECOVERY_NEEDED if MD_RECOVERY_FROZEN is set. So when we clear _FROZEN, we must set _NEEDED and ensure that md_check_recovery gets run. Otherwise we could miss out on something that is needed. In particular, this can make it impossible to remove a failed device from an array is the 'recovery-needed' processing didn't happen. Suitable for stable kernels since 3.13. Reported-and-tested-by: Joe Lawrence <joe.lawrence@stratus.com> Fixes: 30b8feb7Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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