kernel: add a ubi forced detach ioctl

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 40417

target/linux/generic/patches-3.10/413-mtd-ubi-forced-detach.patch

@@ -0,0 +1,41 @@
+--- a/drivers/mtd/ubi/cdev.c
++++ b/drivers/mtd/ubi/cdev.c
+@@ -974,7 +974,7 @@ static long ubi_cdev_ioctl(struct file *
+ 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))
+@@ -1024,6 +1024,10 @@ static long ctrl_cdev_ioctl(struct file
+ 	}
+ 
+ 	/* Detach an MTD device command */
++	case UBI_IOCFDET:
++		force = 1;
++		/* no break */
++
+ 	case UBI_IOCDET:
+ 	{
+ 		int ubi_num;
+@@ -1036,7 +1040,7 @@ static long ctrl_cdev_ioctl(struct file
+ 		}
+ 
+ 		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;
+ 	}
+--- a/include/uapi/mtd/ubi-user.h
++++ b/include/uapi/mtd/ubi-user.h
+@@ -168,6 +168,7 @@
+ #define UBI_IOCATT _IOW(UBI_CTRL_IOC_MAGIC, 64, struct ubi_attach_req)
+ /* Detach an MTD device */
+ #define UBI_IOCDET _IOW(UBI_CTRL_IOC_MAGIC, 65, __s32)
++#define UBI_IOCFDET _IOW(UBI_CTRL_IOC_MAGIC, 99, __s32)
+ 
+ /* ioctl commands of UBI volume character devices */
+