libata: add ata_sg_is_last() helper, use it in several drivers

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index d457f5673476..be7c378dcd36 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -785,22 +785,24 @@ static void mv_port_stop(struct ata_port *ap)
 static void mv_fill_sg(struct ata_queued_cmd *qc)
 {
         struct mv_port_priv *pp = qc->ap->private_data;
-        unsigned int i;
+        unsigned int i = 0;
+        struct scatterlist *sg;
 
-        for (i = 0; i < qc->n_elem; i++) {
+        ata_for_each_sg(sg, qc) {
                 u32 sg_len;
                 dma_addr_t addr;
 
-                addr = sg_dma_address(&qc->sg[i]);
-                sg_len = sg_dma_len(&qc->sg[i]);
+                addr = sg_dma_address(sg);
+                sg_len = sg_dma_len(sg);
 
                 pp->sg_tbl[i].addr = cpu_to_le32(addr & 0xffffffff);
                 pp->sg_tbl[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
                 assert(0 == (sg_len & ~MV_DMA_BOUNDARY));
                 pp->sg_tbl[i].flags_size = cpu_to_le32(sg_len);
-        }
-        if (0 < qc->n_elem) {
-                pp->sg_tbl[qc->n_elem - 1].flags_size |= EPRD_FLAG_END_OF_TBL;
+                if (ata_sg_is_last(sg, qc))
+                        pp->sg_tbl[i].flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+
+                i++;
         }
 }