firewire: sbp2: use scsi_dma_(un)map

Use the scsi_dma_map/scsi_dma_unmap helper to simplify the code
a little.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 4 insertions, 9 deletions

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 2e202d3bf84d..6ffaef3307e8 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1296,10 +1296,7 @@ static struct fw_driver sbp2_driver = {
 static void sbp2_unmap_scatterlist(struct device *card_device,
                                    struct sbp2_command_orb *orb)
 {
-        if (scsi_sg_count(orb->cmd))
-                dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
-                             scsi_sg_count(orb->cmd),
-                             orb->cmd->sc_data_direction);
+        scsi_dma_unmap(orb->cmd);
 
         if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
                 dma_unmap_single(card_device, orb->page_table_bus,
@@ -1405,9 +1402,8 @@ static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
         struct scatterlist *sg = scsi_sglist(orb->cmd);
         int i, n;
 
-        n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
-                       orb->cmd->sc_data_direction);
-        if (n == 0)
+        n = scsi_dma_map(orb->cmd);
+        if (n <= 0)
                 goto fail;
 
         /*
@@ -1453,8 +1449,7 @@ static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
         return 0;
 
  fail_page_table:
-        dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
-                     scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
+        scsi_dma_unmap(orb->cmd);
  fail:
         return -ENOMEM;
 }