From: Sumit.Saxena@avagotech.com <Sumit.Saxena@avagotech.com>
Date: Fri, 12 Sep 2014 13:27:18 +0000 (+0530)
Subject: megaraid_sas : Use writeq for 64bit pci write to avoid spinlock overhead
X-Git-Tag: fixes-for-v3.18-merge-window~25^2^2~112
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0756040952582c4e7c2f23ff2af882c0f0c7a516;p=pandora-kernel.git

megaraid_sas : Use writeq for 64bit pci write to avoid spinlock overhead

Resending the patch. Addressed the review comments from Tomas Henzl.
Reduce the assingment for u64 req_data variable.

Use writeq() for 64bit PCI write instead of writel() to avoid additional lock overhead.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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