[SCSI] megaraid_sas: switch fw_outstanding to an atomic_t
This patch( originally submitted by Christoph Hellwig) removes instance_lock and changes fw_outstanding variable data type to atomic_t. Signed-off-by: NSumant Patro <Sumant.Patro@lsil.com> Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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