ide-scsi: fix race in idescsi_transfer_pc()

Start DMA engine before sending content of packet command (otherwise
it is possible that IRQ will happen before DMA engine is started).

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

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 569ffde6d04..2553ef4d5a9 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -494,13 +494,14 @@ static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
         /* Set the interrupt routine */
         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 
-        /* Send the actual packet */
-        hwif->output_data(drive, NULL, scsi->pc->c, 12);
-
         if (pc->flags & PC_FLAG_DMA_OK) {
                 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
                 hwif->dma_ops->dma_start(drive);
         }
+
+        /* Send the actual packet */
+        hwif->output_data(drive, NULL, scsi->pc->c, 12);
+
         return ide_started;
 }