megaraid_sas : Use writeq for 64bit pci write to avoid spinlock overhead
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 <45fdae0e80c55fee257113fbd3e01357c37bfd12@avagotech.com>
Signed-off-by: Kashyap Desai <5c76991d5e6936969ae71bb8255acf4ae2e4f8da@avagotech.com>
Reviewed-by: Tomas Henzl <ed03cdd404c1c501a81ee6cc756c3c81b1d33f83@redhat.com>
Signed-off-by: Christoph Hellwig <923f7720577207a44b32e59bbfbea59d27f1ae8e@lst.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs