UBI: return ENOSPC if no enough space available

UBI: attaching mtd1 to ubi0
UBI: scanning is finished
UBI error: init_volumes: not enough PEBs, required 706, available 686
UBI error: ubi_wl_init: no enough physical eraseblocks (-20, need 1)
UBI error: ubi_attach_mtd_dev: failed to attach mtd1, error -12 <= NOT ENOMEM
UBI error: ubi_init: cannot attach mtd1

If available PEBs are not enough when initializing volumes, return -ENOSPC
directly. If available PEBs are not enough when initializing WL, return
-ENOSPC instead of -ENOMEM.

Cc: stable@vger.kernel.org
Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: David Gstir <david@sigma-star.at>

drivers/mtd/ubi/vtbl.c

@@ -649,6 +649,7 @@ static int init_volumes(struct ubi_device *ubi,
 		if (ubi->corr_peb_count)
 			ubi_err(ubi, "%d PEBs are corrupted and not used",
 				ubi->corr_peb_count);
+		return -ENOSPC;
 	}
 	ubi->rsvd_pebs += reserved_pebs;
 	ubi->avail_pebs -= reserved_pebs;

drivers/mtd/ubi/wl.c

@@ -1601,6 +1601,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
 		if (ubi->corr_peb_count)
 			ubi_err(ubi, "%d PEBs are corrupted and not used",
 				ubi->corr_peb_count);
+		err = -ENOSPC;
 		goto out_free;
 	}
 	ubi->avail_pebs -= reserved_pebs;