[PATCH 1/20] ide: fix ->io_32bit race in set_io_32bit()

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

set_io_32bit() (ide_procset_t function) can race against running
PIO transfers.  Fix it by using ide_spin_wait_hwgroup().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
 drivers/ide/ide.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: b/drivers/ide/ide.c
===================================================================
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -791,11 +791,17 @@ int set_io_32bit(ide_drive_t *drive, int
 	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 		return -EINVAL;
 
+	if (ide_spin_wait_hwgroup(drive))
+		return -EBUSY;
+
 	drive->io_32bit = arg;
 #ifdef CONFIG_BLK_DEV_DTC2278
 	if (HWIF(drive)->chipset == ide_dtc2278)
 		HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 #endif /* CONFIG_BLK_DEV_DTC2278 */
+
+	spin_unlock_irq(&ide_lock);
+
 	return 0;
 }