From: NeilBrown <neilb@suse.de>
Date: Wed, 27 Jul 2011 01:00:36 +0000 (+1000)
Subject: md/raid5: Avoid BUG caused by multiple failures.
X-Git-Tag: v3.1-rc1~131^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cfa7b0f67b4d899efc7f39eb7e172fd79237811;p=pandora-kernel.git

md/raid5: Avoid BUG caused by multiple failures.

While preparing to write a stripe we keep the parity block or blocks
locked (R5_LOCKED) - towards the end of schedule_reconstruction.

If the array is discovered to have failed before this write completes
we can leave those blocks LOCKED, and init_stripe will notice that a
free stripe still has a locked block and will complain.

So clear the R5_LOCKED flag in handle_failed_stripe, and demote the
'BUG' to a 'WARN_ON'.

Signed-off-by: NeilBrown <neilb@suse.de>
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