From: Shaohua Li <shli@kernel.org>
Date: Thu, 19 Jul 2012 06:01:31 +0000 (+1000)
Subject: raid5: reduce chance release_stripe() taking device_lock
X-Git-Tag: v3.6-rc1~21^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4eb788df670ef30a19b7ea15b107ea440544bc80;p=pandora-kernel.git

raid5: reduce chance release_stripe() taking device_lock

release_stripe() is a place conf->device_lock is heavily contended. We take the
lock even stripe count isn't 1, which isn't required.

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