UBI: add ioctl for unmap operation

This patch adds ioctl for the LEB unmap operation (as a debugging
option so far).

[Re-named ioctl to make it look the same as the other one and made
 some minor stylistic changes. Artem Bityutskiy.]

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 055e3f5..fd7e0f9 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -532,13 +532,26 @@
 		err = ubi_leb_map(desc, req.lnum, req.dtype);
 		break;
 	}
+
+	/* Logical eraseblock un-map command */
+	case UBI_IOCEBUNMAP:
+	{
+		int32_t lnum;
+
+		err = get_user(lnum, (__user int32_t *)argp);
+		if (err) {
+			err = -EFAULT;
+			break;
+		}
+		err = ubi_leb_unmap(desc, lnum);
+		break;
+	}
 #endif
 
 	default:
 		err = -ENOTTY;
 		break;
 	}
-
 	return err;
 }