ide-atapi: start dma in a drive-specific way

There should be no functionality change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index c9beda5fca18..e8688c0f8645 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -489,7 +489,7 @@ static int ide_delayed_transfer_pc(ide_drive_t *drive)
 
 static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 {
-        struct ide_atapi_pc *pc = drive->pc;
+        struct ide_atapi_pc *uninitialized_var(pc);
         ide_hwif_t *hwif = drive->hwif;
         struct request *rq = hwif->hwgroup->rq;
         ide_expiry_t *expiry;
@@ -518,6 +518,8 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
                 timeout = rq->timeout;
                 expiry  = ide_cd_expiry;
         } else {
+                pc = drive->pc;
+
                 cmd_len = ATAPI_MIN_CDB_BYTES;
 
                 /*
@@ -550,9 +552,14 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
         ide_set_handler(drive, ide_pc_intr, timeout, expiry);
 
         /* Begin DMA, if necessary */
-        if (pc->flags & PC_FLAG_DMA_OK) {
-                pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
-                hwif->dma_ops->dma_start(drive);
+        if (dev_is_idecd(drive)) {
+                if (drive->dma)
+                        hwif->dma_ops->dma_start(drive);
+        } else {
+                if (pc->flags & PC_FLAG_DMA_OK) {
+                        pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
+                        hwif->dma_ops->dma_start(drive);
+                }
         }
 
         /* Send the actual packet */