diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 5e1182ca289ba05657fb61bce3372225f02e0904..38cfb0f2adf2b419a27f74c619a79d727137b7e1 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -65,7 +65,10 @@
 /* Background thread name pattern */
 #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd"
 
-/* This marker in the EBA table means that the LEB is um-mapped */
+/*
+ * This marker in the EBA table means that the LEB is um-mapped.
+ * NOTE! It has to have the same value as %UBI_ALL.
+ */
 #define UBI_LEB_UNMAPPED -1
 
 /*
@@ -81,10 +84,7 @@
  */
 #define UBI_PROT_QUEUE_LEN 10
 
-/*
- * When a field of the attaching information has this value - its real value is
- * unknown.
- */
+/* The volume ID/LEB number/erase counter is unknown */
 #define UBI_UNKNOWN -1
 
 /*
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 9838dce7e23557f18ffbee38d42f1979aaae83ba..f636f5df883fb8df129d479ac2733636a31978eb 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -25,6 +25,9 @@
 #include <linux/types.h>
 #include <mtd/ubi-user.h>
 
+/* All voumes/LEBs */
+#define UBI_ALL -1
+
 /*
  * enum ubi_open_mode - UBI volume open mode constants.
  *