--- zzzz-none-000/linux-5.4.213/drivers/mtd/ubi/cdev.c	2022-09-15 10:04:56.000000000 +0000
+++ miami-7690-761/linux-5.4.213/drivers/mtd/ubi/cdev.c	2024-05-29 11:19:52.000000000 +0000
@@ -1003,7 +1003,7 @@
 static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
 			    unsigned long arg)
 {
-	int err = 0;
+	int err = 0, force = 0;
 	void __user *argp = (void __user *)arg;
 
 	if (!capable(CAP_SYS_RESOURCE))
@@ -1053,6 +1053,10 @@
 	}
 
 	/* Detach an MTD device command */
+	case UBI_IOCFDET:
+		force = 1;
+		/* fallthrough */
+
 	case UBI_IOCDET:
 	{
 		int ubi_num;
@@ -1065,7 +1069,7 @@
 		}
 
 		mutex_lock(&ubi_devices_mutex);
-		err = ubi_detach_mtd_dev(ubi_num, 0);
+		err = ubi_detach_mtd_dev(ubi_num, force);
 		mutex_unlock(&ubi_devices_mutex);
 		break;
 	}