From: NeilBrown <neilb@suse.de>
Date: Sun, 8 Jan 2012 14:41:51 +0000 (+1100)
Subject: md/raid1: perform bad-block tests for WriteMostly devices too.
X-Git-Tag: v3.2.2~91
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45c5b2b95f829018321325129d824a6154d5f955;p=pandora-kernel.git

md/raid1: perform bad-block tests for WriteMostly devices too.

commit 307729c8bc5b5a41361af8af95906eee7552acb1 upstream.

We normally try to avoid reading from write-mostly devices, but when
we do we really have to check for bad blocks and be sure not to
try reading them.

With the current code, best_good_sectors might not get set and that
causes zero-length read requests to be send down which is very
confusing.

This bug was introduced in commit d2eb35acfdccbe2 and so the patch
is suitable for 3.1.x and 3.2.x

Reported-and-tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reported-and-tested-by: Art -kwaak- van Breemen <ard@telegraafnet.nl>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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