1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 32eaa3f80515..e2eb408a8a18 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -800,7 +800,20 @@ static ide_startstop_t do_special (ide_drive_t *drive)
                 s->b.set_tune = 0;
 
                 if (set_pio_mode_abuse(drive->hwif, req_pio)) {
-                        if (hwif->set_pio_mode)
+
+                        if (hwif->set_pio_mode == NULL)
+                                return ide_stopped;
+
+                        /*
+                         * take ide_lock for drive->[no_]unmask/[no_]io_32bit
+                         */
+                        if (req_pio == 8 || req_pio == 9) {
+                                unsigned long flags;
+
+                                spin_lock_irqsave(&ide_lock, flags);
+                                hwif->set_pio_mode(drive, req_pio);
+                                spin_unlock_irqrestore(&ide_lock, flags);
+                        } else
                                 hwif->set_pio_mode(drive, req_pio);
                 } else {
                         int keep_dma = drive->using_dma;