scsi: remove current_cmnd field from struct scsi_device

The field is only used by the 53c700 driver, so move it into the
driver-private device data instead of having it in the common structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index 5556201..95e32a4 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -1120,9 +1120,9 @@
 				"reselection is tag %d, slot %p(%d)\n",
 				hostdata->msgin[2], slot, slot->tag);
 		} else {
-			struct scsi_cmnd *SCp;
+			struct NCR_700_Device_Parameters *p = SDp->hostdata;
+			struct scsi_cmnd *SCp = p->current_cmnd;
 
-			SCp = SDp->current_cmnd;
 			if(unlikely(SCp == NULL)) {
 				sdev_printk(KERN_ERR, SDp,
 					"no saved request for untagged cmd\n");
@@ -1825,9 +1825,11 @@
 		CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
 		       slot->tag, slot);
 	} else {
+		struct NCR_700_Device_Parameters *p = SCp->device->hostdata;
+
 		slot->tag = SCSI_NO_TAG;
 		/* save current command for reselection */
-		SCp->device->current_cmnd = SCp;
+		p->current_cmnd = SCp;
 	}
 	/* sanity check: some of the commands generated by the mid-layer
 	 * have an eccentric idea of their sc_data_direction */