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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