diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 5326435..43b7d72 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -216,6 +216,7 @@
 	/* Chip-supported device locking */
 	int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 	int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
+	int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 
 	/* Power Management functions */
 	int (*suspend) (struct mtd_info *mtd);