scsi: qla2xxx: use shadow register for ISP27XX
For ISP27XX, use shadow register to read FW provided REQQ's consumer index. The shadow register is dma'ed by firmware. Signed-off-by:Quinn Tran <quinn.tran@cavium.com> Signed-off-by:
Himanshu Madhani <himanshu.madhani@cavium.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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