From: Shaohua Li <shli@kernel.org>
Date: Sat, 19 Oct 2013 06:50:28 +0000 (+0800)
Subject: raid5: set bio bi_vcnt 0 for discard request
X-Git-Tag: v3.12-rc7~12^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=37c61ff31e9b5e3fcf3cc6579f5c68f6ad40c4b1;p=pandora-kernel.git

raid5: set bio bi_vcnt 0 for discard request

SCSI layer will add new payload for discard request. If two bios are merged
to one, the second bio has bi_vcnt 1 which is set in raid5. This will confuse
SCSI and cause oops.

Suitable for backport to 3.7+

Cc: stable@vger.kernel.org (v3.7+)
Reported-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
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