diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index dea314ce33d3..f3ee098b69c7 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -949,6 +949,7 @@ static void ide_port_setup_devices(ide_hwif_t *hwif)
 {
 	int i;
 
+	mutex_lock(&ide_cfg_mtx);
 	for (i = 0; i < MAX_DRIVES; i++) {
 		ide_drive_t *drive = &hwif->drives[i];
 
@@ -963,6 +964,7 @@ static void ide_port_setup_devices(ide_hwif_t *hwif)
 
 		ide_add_drive_to_hwgroup(drive);
 	}
+	mutex_unlock(&ide_cfg_mtx);
 }
 
 /*
@@ -1088,8 +1090,6 @@ static int init_irq (ide_hwif_t *hwif)
 			hwif->sharing_irq ? "shar" : "serializ", match->name);
 	printk("\n");
 
-	ide_port_setup_devices(hwif);
-
 	mutex_unlock(&ide_cfg_mtx);
 	return 0;
 out_unlink:
@@ -1447,6 +1447,8 @@ int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
 			continue;
 		}
 
+		ide_port_setup_devices(hwif);
+
 		ide_acpi_init(hwif);
 		ide_acpi_port_init_devices(hwif);
 	}