diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 598ef10..7ad046b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -450,8 +450,8 @@
 		qc->scsicmd = cmd;
 		qc->scsidone = done;
 
-		qc->__sg = (struct scatterlist *) cmd->request_buffer;
-		qc->n_elem = cmd->use_sg;
+		qc->__sg = scsi_sglist(cmd);
+		qc->n_elem = scsi_sg_count(cmd);
 	} else {
 		cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
 		done(cmd);
@@ -1493,13 +1493,13 @@
 	/* data is present; dma-map it */
 	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
 	    cmd->sc_data_direction == DMA_TO_DEVICE) {
-		if (unlikely(cmd->request_bufflen < 1)) {
+		if (unlikely(scsi_bufflen(cmd) < 1)) {
 			ata_dev_printk(dev, KERN_WARNING,
 				       "WARNING: zero len r/w req\n");
 			goto err_did;
 		}
 
-		ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
+		ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
 
 		qc->dma_dir = cmd->sc_data_direction;
 	}
@@ -1553,7 +1553,7 @@
 	u8 *buf;
 	unsigned int buflen;
 
-	struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
+	struct scatterlist *sg = scsi_sglist(cmd);
 
 	if (sg) {
 		buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
@@ -1580,7 +1580,7 @@
 
 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
 {
-	struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
+	struct scatterlist *sg = scsi_sglist(cmd);
 	if (sg)
 		kunmap_atomic(buf - sg->offset, KM_IRQ0);
 }
@@ -2383,7 +2383,7 @@
 	}
 
 	qc->tf.command = ATA_CMD_PACKET;
-	qc->nbytes = scmd->request_bufflen;
+	qc->nbytes = scsi_bufflen(scmd);
 
 	/* check whether ATAPI DMA is safe */
 	if (!using_pio && ata_check_atapi_dma(qc))
@@ -2633,7 +2633,7 @@
 	case ATA_CMD_WRITE_LONG_ONCE:
 		if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
 			goto invalid_fld;
-		qc->sect_size = scmd->request_bufflen;
+		qc->sect_size = scsi_bufflen(scmd);
 	}
 
 	/*
@@ -2663,7 +2663,7 @@
 	 * TODO: find out if we need to do more here to
 	 *       cover scatter/gather case.
 	 */
-	qc->nbytes = scmd->request_bufflen;
+	qc->nbytes = scsi_bufflen(scmd);
 
 	/* request result TF */
 	qc->flags |= ATA_QCFLAG_RESULT_TF;