scsi: dc395x: fix DMA API usage in sg_update_list

We need to transfer device ownership to the CPU before we can manipulate
the mapped data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 8d7a26a33951..f3b65e5efe2b 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -1871,6 +1871,11 @@ static void sg_update_list(struct ScsiReqBlk *srb, u32 left)
                         xferred -= psge->length;
                 } else {
                         /* Partial SG entry done */
+                        pci_dma_sync_single_for_cpu(srb->dcb->
+                                            acb->dev,
+                                            srb->sg_bus_addr,
+                                            SEGMENTX_LEN,
+                                            PCI_DMA_TODEVICE);
                         psge->length -= xferred;
                         psge->address += xferred;
                         srb->sg_index = idx;