[SCSI] 3w-9xxx: remove unnecessary local_irq_save/restore for scsi sg copy API

Since the commit 50bed2e2862a8f3a4f7d683d0d27292e71ef18b9 (sg: disable
interrupts inside sg_copy_buffer), no need to disable interrupts
before calling scsi_sg_copy_from_buffer. So we can simplify
twa_scsiop_execute_scsi_complete() a bit, which disables interrupts
just for scsi_sg_copy_from_buffer.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Adam Radford <linuxraid@amcc.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/3w-9xxx.c

@@ -1924,12 +1924,9 @@ static void twa_scsiop_execute_scsi_complete(TW_Device_Extension *tw_dev, int re
 	    (cmd->sc_data_direction == DMA_FROM_DEVICE ||
 	     cmd->sc_data_direction == DMA_BIDIRECTIONAL)) {
 		if (scsi_sg_count(cmd) == 1) {
-			unsigned long flags;
 			void *buf = tw_dev->generic_buffer_virt[request_id];
 
-			local_irq_save(flags);
 			scsi_sg_copy_from_buffer(cmd, buf, TW_SECTOR_SIZE);
-			local_irq_restore(flags);
 		}
 	}
 } /* End twa_scsiop_execute_scsi_complete() */