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Commit 26ac1073 authored by NeilBrown's avatar NeilBrown
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md/raid5: Fix livelock when array is both resyncing and degraded.



Commit a7854487:
  md: When RAID5 is dirty, force reconstruct-write instead of read-modify-write.

Causes an RCW cycle to be forced even when the array is degraded.
A degraded array cannot support RCW as that requires reading all data
blocks, and one may be missing.

Forcing an RCW when it is not possible causes a live-lock and the code
spins, repeatedly deciding to do something that cannot succeed.

So change the condition to only force RCW on non-degraded arrays.

Reported-by: default avatarManibalan P <pmanibalan@amiindia.co.in>
Bisected-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Tested-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Fixes: a7854487
Cc: stable@vger.kernel.org (v3.7+)
parent f04ebb0b
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