From: NeilBrown <neilb@suse.de>
Date: Sat, 7 Aug 2010 11:17:00 +0000 (+1000)
Subject: md/raid10: fix deadlock with unaligned read during resync
X-Git-Tag: v2.6.27.51~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea77f594f059adbc1f5b92650890a86b8464151b;p=pandora-kernel.git

md/raid10: fix deadlock with unaligned read during resync

commit 51e9ac77035a3dfcb6fc0a88a0d80b6f99b5edb1 upstream.

If the 'bio_split' path in raid10-read is used while
resync/recovery is happening it is possible to deadlock.
Fix this be elevating ->nr_waiting for the duration of both
parts of the split request.

This fixes a bug that has been present since 2.6.22
but has only started manifesting recently for unknown reasons.
It is suitable for and -stable since then.

Reported-by:  Justin Bronder <jsbronder@gentoo.org>
Tested-by:  Justin Bronder <jsbronder@gentoo.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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