1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index d41348f2245e..1d261298d61a 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -514,16 +514,16 @@ static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
         /* Request to transfer the entire buffer at once */
         bcount = min(pc->req_xfer, 63 * 1024);
 
-        if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
+        if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) {
                 hwif->sg_mapped = 1;
                 dma = !hwif->dma_ops->dma_setup(drive);
                 hwif->sg_mapped = 0;
         }
 
-        ide_pktcmd_tf_load(drive, 0, bcount, dma);
+        if (!dma)
+                pc->flags &= ~PC_FLAG_DMA_OK;
 
-        if (dma)
-                pc->flags |= PC_FLAG_DMA_OK;
+        ide_pktcmd_tf_load(drive, 0, bcount, dma);
 
         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
@@ -547,8 +547,12 @@ static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *r
                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 
         if (blk_sense_request(rq) || blk_special_request(rq)) {
-                return idescsi_issue_pc(drive,
-                                (struct ide_atapi_pc *) rq->special);
+                struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
+
+                if (drive->using_dma && !idescsi_map_sg(drive, pc))
+                        pc->flags |= PC_FLAG_DMA_OK;
+
+                return idescsi_issue_pc(drive, pc);
         }
         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
         idescsi_end_request (drive, 0, 0);