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>
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 569ffde..2553ef4 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -494,13 +494,14 @@
/* 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;
}