From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 11 Apr 2008 04:29:27 +0000 (-0700)
Subject: md: close a livelock window in handle_parity_checks5
X-Git-Tag: v2.6.25-rc9~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd2ab67030e9116f1e4aae1289220255412b37fd;p=pandora-kernel.git

md: close a livelock window in handle_parity_checks5

If a failure is detected after a parity check operation has been initiated,
but before it completes handle_parity_checks5 will never quiesce operations on
the stripe.

Explicitly handle this case by "canceling" the parity check, i.e.  clear the
STRIPE_OP_CHECK flags and queue the stripe on the handle list again to refresh
any non-uptodate blocks.

Kernel versions >= 2.6.23 are susceptible.

Cc: <stable@kernel.org>
Cc: NeilBrown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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