diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index cbfc679..9dfe7bb 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -52,17 +52,11 @@
 	int res;
 
 	stats = part->master->ecc_stats;
-
-	if (from >= mtd->size)
-		len = 0;
-	else if (from + len > mtd->size)
-		len = mtd->size - from;
-	res = part->master->read(part->master, from + part->offset,
-				   len, retlen, buf);
+	res = mtd_read(part->master, from + part->offset, len, retlen, buf);
 	if (unlikely(res)) {
-		if (res == -EUCLEAN)
+		if (mtd_is_bitflip(res))
 			mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
-		if (res == -EBADMSG)
+		if (mtd_is_eccerr(res))
 			mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
 	}
 	return res;
@@ -78,12 +72,12 @@
 		return -EINVAL;
 	if (ops->datbuf && from + ops->len > mtd->size)
 		return -EINVAL;
-	res = part->master->read_oob(part->master, from + part->offset, ops);
+	res = mtd_read_oob(part->master, from + part->offset, ops);
 
 	if (unlikely(res)) {
-		if (res == -EUCLEAN)
+		if (mtd_is_bitflip(res))
 			mtd->ecc_stats.corrected++;
-		if (res == -EBADMSG)
+		if (mtd_is_eccerr(res))
 			mtd->ecc_stats.failed++;
 	}
 	return res;
@@ -93,58 +87,35 @@
 		size_t len, size_t *retlen, u_char *buf)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->read_user_prot_reg(part->master, from,
-					len, retlen, buf);
+	return mtd_read_user_prot_reg(part->master, from, len, retlen, buf);
 }
 
 static int part_get_user_prot_info(struct mtd_info *mtd,
 		struct otp_info *buf, size_t len)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->get_user_prot_info(part->master, buf, len);
+	return mtd_get_user_prot_info(part->master, buf, len);
 }
 
 static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
 		size_t len, size_t *retlen, u_char *buf)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->read_fact_prot_reg(part->master, from,
-					len, retlen, buf);
+	return mtd_read_fact_prot_reg(part->master, from, len, retlen, buf);
 }
 
 static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
 		size_t len)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->get_fact_prot_info(part->master, buf, len);
+	return mtd_get_fact_prot_info(part->master, buf, len);
 }
 
 static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
 		size_t *retlen, const u_char *buf)
 {
 	struct mtd_part *part = PART(mtd);
-	if (!(mtd->flags & MTD_WRITEABLE))
-		return -EROFS;
-	if (to >= mtd->size)
-		len = 0;
-	else if (to + len > mtd->size)
-		len = mtd->size - to;
-	return part->master->write(part->master, to + part->offset,
-				    len, retlen, buf);
-}
-
-static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
-		size_t *retlen, const u_char *buf)
-{
-	struct mtd_part *part = PART(mtd);
-	if (!(mtd->flags & MTD_WRITEABLE))
-		return -EROFS;
-	if (to >= mtd->size)
-		len = 0;
-	else if (to + len > mtd->size)
-		len = mtd->size - to;
-	return part->master->panic_write(part->master, to + part->offset,
-				    len, retlen, buf);
+	return mtd_write(part->master, to + part->offset, len, retlen, buf);
 }
 
 static int part_write_oob(struct mtd_info *mtd, loff_t to,
@@ -152,41 +123,34 @@
 {
 	struct mtd_part *part = PART(mtd);
 
-	if (!(mtd->flags & MTD_WRITEABLE))
-		return -EROFS;
-
 	if (to >= mtd->size)
 		return -EINVAL;
 	if (ops->datbuf && to + ops->len > mtd->size)
 		return -EINVAL;
-	return part->master->write_oob(part->master, to + part->offset, ops);
+	return mtd_write_oob(part->master, to + part->offset, ops);
 }
 
 static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
 		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,
 		size_t len)
 {
 	struct mtd_part *part = PART(mtd);
-	return part->master->lock_user_prot_reg(part->master, from, len);
+	return mtd_lock_user_prot_reg(part->master, from, len);
 }
 
 static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
 	struct mtd_part *part = PART(mtd);
 	int ret;
-	if (!(mtd->flags & MTD_WRITEABLE))
-		return -EROFS;
-	if (instr->addr >= mtd->size)
-		return -EINVAL;
+
 	instr->addr += part->offset;
-	ret = part->master->erase(part->master, instr);
+	ret = mtd_erase(part->master, instr);
 	if (ret) {
 		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
 			instr->fail_addr -= part->offset;
@@ -197,7 +161,7 @@
 
 void mtd_erase_callback(struct erase_info *instr)
 {
-	if (instr->mtd->erase == part_erase) {
+	if (instr->mtd->_erase == part_erase) {
 		struct mtd_part *part = PART(instr->mtd);
 
 		if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
@@ -211,32 +175,26 @@
 static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
 	struct mtd_part *part = PART(mtd);
-	if ((len + ofs) > mtd->size)
-		return -EINVAL;
-	return part->master->lock(part->master, ofs + part->offset, len);
+	return mtd_lock(part->master, ofs + part->offset, len);
 }
 
 static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 {
 	struct mtd_part *part = PART(mtd);
-	if ((len + ofs) > mtd->size)
-		return -EINVAL;
-	return part->master->unlock(part->master, ofs + part->offset, len);
+	return mtd_unlock(part->master, ofs + part->offset, len);
 }
 
 static void part_sync(struct mtd_info *mtd)
 {
 	struct mtd_part *part = PART(mtd);
-	part->master->sync(part->master);
+	mtd_sync(part->master);
 }
 
 static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
 {
 	struct mtd_part *part = PART(mtd);
-	if (ofs >= mtd->size)
-		return -EINVAL;
 	ofs += part->offset;
-	return part->master->block_isbad(part->master, ofs);
+	return mtd_block_isbad(part->master, ofs);
 }
 
 static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
@@ -244,12 +202,8 @@
 	struct mtd_part *part = PART(mtd);
 	int res;
 
-	if (!(mtd->flags & MTD_WRITEABLE))
-		return -EROFS;
-	if (ofs >= mtd->size)
-		return -EINVAL;
 	ofs += part->offset;
-	res = part->master->block_markbad(part->master, ofs);
+	res = mtd_block_markbad(part->master, ofs);
 	if (!res)
 		mtd->ecc_stats.badblocks++;
 	return res;
@@ -303,39 +257,36 @@
 	slave->mtd.name = part->name;
 	slave->mtd.owner = master->owner;
 
-	slave->mtd.read = part_read;
-	slave->mtd.write = part_write;
+	slave->mtd._read = part_read;
+	slave->mtd._write = part_write;
 
-	if (master->panic_write)
-		slave->mtd.panic_write = part_panic_write;
-
-	if (master->read_oob)
-		slave->mtd.read_oob = part_read_oob;
-	if (master->write_oob)
-		slave->mtd.write_oob = part_write_oob;
-	if (master->read_user_prot_reg)
-		slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
-	if (master->read_fact_prot_reg)
-		slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
-	if (master->write_user_prot_reg)
-		slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
-	if (master->lock_user_prot_reg)
-		slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
-	if (master->get_user_prot_info)
-		slave->mtd.get_user_prot_info = part_get_user_prot_info;
-	if (master->get_fact_prot_info)
-		slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
-	if (master->sync)
-		slave->mtd.sync = part_sync;
-	if (master->lock)
-		slave->mtd.lock = part_lock;
-	if (master->unlock)
-		slave->mtd.unlock = part_unlock;
-	if (master->block_isbad)
-		slave->mtd.block_isbad = part_block_isbad;
-	if (master->block_markbad)
-		slave->mtd.block_markbad = part_block_markbad;
-	slave->mtd.erase = part_erase;
+	if (master->_read_oob)
+		slave->mtd._read_oob = part_read_oob;
+	if (master->_write_oob)
+		slave->mtd._write_oob = part_write_oob;
+	if (master->_read_user_prot_reg)
+		slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
+	if (master->_read_fact_prot_reg)
+		slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
+	if (master->_write_user_prot_reg)
+		slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
+	if (master->_lock_user_prot_reg)
+		slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
+	if (master->_get_user_prot_info)
+		slave->mtd._get_user_prot_info = part_get_user_prot_info;
+	if (master->_get_fact_prot_info)
+		slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
+	if (master->_sync)
+		slave->mtd._sync = part_sync;
+	if (master->_lock)
+		slave->mtd._lock = part_lock;
+	if (master->_unlock)
+		slave->mtd._unlock = part_unlock;
+	if (master->_block_isbad)
+		slave->mtd._block_isbad = part_block_isbad;
+	if (master->_block_markbad)
+		slave->mtd._block_markbad = part_block_markbad;
+	slave->mtd._erase = part_erase;
 	slave->master = master;
 	slave->offset = part->offset;
 	slave->index = partno;
@@ -416,12 +367,11 @@
 	}
 
 	slave->mtd.ecclayout = master->ecclayout;
-	if (master->block_isbad) {
+	if (master->_block_isbad) {
 		uint64_t offs = 0;
 
 		while (offs < slave->mtd.size) {
-			if (master->block_isbad(master,
-						offs + slave->offset))
+			if (mtd_block_isbad(master, offs + slave->offset))
 				slave->mtd.ecc_stats.badblocks++;
 			offs += slave->mtd.erasesize;
 		}