From: Haiyan Hu <huhaiyan@huawei.com>
Date: Tue, 10 Sep 2013 03:25:37 +0000 (+0800)
Subject: NVMe: Avoid shift operation when writing cq head doorbell
X-Git-Tag: v3.14-rc2~23^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b80d5ccca3a012e91ca64a2a0b13049163a6a698;p=pandora-kernel.git

NVMe: Avoid shift operation when writing cq head doorbell

Changes the type of dev->db_stride to unsigned and changes the value
stored there to be 1 << the current value. Then there is less
calculation to be done at completion time.

Signed-off-by: Haiyan Hu <huhaiyan@huawei.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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