ide: add drive->dma_mode field

Add dma_mode field to ide_drive_t matching dma_mode field used in
struct ata_device.

The validity of the field is restricted to ->dma_pio_mode method
only currently in IDE subsystem.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ide/aec62xx.c

@@ -136,6 +136,7 @@ static void aec6260_set_mode(ide_drive_t *drive, const u8 speed)
 
 static void aec_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
+	drive->dma_mode = pio + XFER_PIO_0;
 	drive->hwif->port_ops->set_dma_mode(drive, pio + XFER_PIO_0);
 }
 

drivers/ide/ide-xfer-mode.c

@@ -167,9 +167,11 @@ int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
 	if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 		if (ide_config_drive_speed(drive, mode))
 			return -1;
+		drive->dma_mode = mode;
 		port_ops->set_dma_mode(drive, mode);
 		return 0;
 	} else {
+		drive->dma_mode = mode;
 		port_ops->set_dma_mode(drive, mode);
 		return ide_config_drive_speed(drive, mode);
 	}

include/linux/ide.h

@@ -516,6 +516,7 @@ struct ide_drive_s {
         u8	current_speed;	/* current transfer rate set */
 	u8	desired_speed;	/* desired transfer rate set */
 	u8	pio_mode;	/* for ->set_pio_mode _only_ */
+	u8	dma_mode;	/* for ->dma_pio_mode _only_ */
         u8	dn;		/* now wide spread use */
 	u8	acoustic;	/* acoustic management */
 	u8	media;		/* disk, cdrom, tape, floppy, ... */