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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-15 21:21:51 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-15 21:21:51 +0200
commitb3d96afccf8b5c67b66a61efb88c53ff029c6611 (patch)
tree879275e500e2f0ac597252996a71a19d73cd6b90
parent63f5abb0959337db0d5bece9cefba03cdcadec51 (diff)
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>
-rw-r--r--drivers/scsi/ide-scsi.c7
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;
}