ide-atapi: teach ide atapi about drive->waiting_for_dma

In addition, we wait for DRQ to be asserted by repeatedly polling
device status no matter what DRQ type each device implements.

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

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 8884877..8c5cf68 100644 (file)
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -511,6 +511,11 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
                return startstop;
        }
 
+       if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
+               if (drive->dma)
+                       drive->waiting_for_dma = 1;
+       }
+
        ireason = ide_read_ireason(drive);
        if (drive->media == ide_tape &&
            (drive->dev_flags & IDE_DFLAG_SCSI) == 0)
@@ -605,6 +610,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout,
 
        /* Issue the packet command */
        if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
+               if (drive->dma)
+                       drive->waiting_for_dma = 0;
                ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
                                    timeout, NULL);
                return ide_started;