From: Shaohua Li <shli@kernel.org>
Date: Thu, 19 Jul 2012 06:01:31 +0000 (+1000)
Subject: raid5: lockless access raid5 overrided bi_phys_segments
X-Git-Tag: v3.6-rc1~21^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e7836bd6f60d659830b87804f7f4026edfe0f1d1;p=pandora-kernel.git

raid5: lockless access raid5 overrided bi_phys_segments

Raid5 overrides bio->bi_phys_segments, accessing it is with device_lock hold,
which is unnecessary, We can make it lockless actually.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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