diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index f371b0d..fdd04bc 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1378,6 +1378,9 @@
 
 		ide_init_port(hwif, i & 1, d);
 		ide_port_cable_detect(hwif);
+
+		hwif->port_flags |= IDE_PFLAG_PROBING;
+
 		ide_port_init_devices(hwif);
 	}
 
@@ -1388,6 +1391,8 @@
 		if (ide_probe_port(hwif) == 0)
 			hwif->present = 1;
 
+		hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
 		if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
 		    hwif->mate == NULL || hwif->mate->present == 0) {
 			if (ide_register_port(hwif)) {
@@ -1569,11 +1574,20 @@
 
 void ide_port_scan(ide_hwif_t *hwif)
 {
+	int rc;
+
 	ide_port_apply_params(hwif);
 	ide_port_cable_detect(hwif);
+
+	hwif->port_flags |= IDE_PFLAG_PROBING;
+
 	ide_port_init_devices(hwif);
 
-	if (ide_probe_port(hwif) < 0)
+	rc = ide_probe_port(hwif);
+
+	hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
+	if (rc < 0)
 		return;
 
 	hwif->present = 1;
diff --git a/drivers/ide/ide-xfer-mode.c b/drivers/ide/ide-xfer-mode.c
index 0b47ca1..46d203c 100644
--- a/drivers/ide/ide-xfer-mode.c
+++ b/drivers/ide/ide-xfer-mode.c
@@ -109,6 +109,12 @@
 
 int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
 {
+	/*
+	 * IORDY may lead to controller lock up on certain controllers
+	 * if the port is not occupied.
+	 */
+	if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
+		return 0;
 	return ata_id_pio_need_iordy(drive->id, pio);
 }
 EXPORT_SYMBOL_GPL(ide_pio_need_iordy);