diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6aa3fb4..d888170 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -314,7 +314,8 @@
 				ret = -EOPNOTSUPP;
 				break;
 			}
-			ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
+			ret = mtd_write_user_prot_reg(mtd, *ppos, len,
+						      &retlen, kbuf);
 			break;
 
 		case MTD_FILE_MODE_RAW:
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f018373..1e7b8d1 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -222,8 +222,7 @@
 		size_t len, size_t *retlen, u_char *buf)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->write_user_prot_reg(part->master, from,
-					len, retlen, buf);
+	return mtd_write_user_prot_reg(part->master, from, len, retlen, buf);
 }
 
 static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 855fb7f..5549607 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -200,13 +200,14 @@
 				   size_t len);
 	int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
 				   size_t len, size_t *retlen, u_char *buf);
+	int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t to, size_t len,
+				    size_t *retlen, u_char *buf);
 
 	/* Backing device capabilities for this device
 	 * - provides mmap capabilities
 	 */
 	struct backing_dev_info *backing_dev_info;
 
-	int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 	int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 
 	/* kvec-based read/write methods.
@@ -361,6 +362,13 @@
 	return mtd->read_user_prot_reg(mtd, from, len, retlen, buf);
 }
 
+static inline int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to,
+					  size_t len, size_t *retlen,
+					  u_char *buf)
+{
+	return mtd->write_user_prot_reg(mtd, to, len, retlen, buf);
+}
+
 static inline struct mtd_info *dev_to_mtd(struct device *dev)
 {
 	return dev ? dev_get_drvdata(dev) : NULL;