diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 21cc5a394..b74d04029 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2409,11 +2409,11 @@ static void nand_set_defaults(struct nand_chip *chip, int busw)
 /*
  * Get the flash and manufacturer id and lookup if the type is supported
  */
-static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
+static const struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 						  struct nand_chip *chip,
 						  int busw, int *maf_id)
 {
-	struct nand_flash_dev *type = NULL;
+	const struct nand_flash_dev *type = NULL;
 	int i, dev_id, maf_idx;
 	int tmp_id, tmp_manf;
 
@@ -2587,7 +2587,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips)
 {
 	int i, busw, nand_maf_id;
 	struct nand_chip *chip = mtd->priv;
-	struct nand_flash_dev *type;
+	const struct nand_flash_dev *type;
 
 	/* Get buswidth to select the correct functions */
 	busw = chip->options & NAND_BUSWIDTH_16;
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index 25b22ecc9..8d7ea767d 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -22,7 +22,7 @@
 +	256	256 Byte page size
 *	512	512 Byte page size
 */
-struct nand_flash_dev nand_flash_ids[] = {
+const struct nand_flash_dev nand_flash_ids[] = {
 
 #ifdef CONFIG_MTD_NAND_MUSEUM_IDS
 	{"NAND 1MiB 5V 8-bit",		0x6e, 256, 1, 0x1000, 0},
@@ -132,7 +132,7 @@ struct nand_flash_dev nand_flash_ids[] = {
 /*
 *	Manufacturer ID list
 */
-struct nand_manufacturers nand_manuf_ids[] = {
+const struct nand_manufacturers nand_manuf_ids[] = {
 	{NAND_MFR_TOSHIBA, "Toshiba"},
 	{NAND_MFR_SAMSUNG, "Samsung"},
 	{NAND_MFR_FUJITSU, "Fujitsu"},
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 94ad0c0e3..519f47e4d 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -470,8 +470,8 @@ struct nand_manufacturers {
 	char * name;
 };
 
-extern struct nand_flash_dev nand_flash_ids[];
-extern struct nand_manufacturers nand_manuf_ids[];
+extern const struct nand_flash_dev nand_flash_ids[];
+extern const struct nand_manufacturers nand_manuf_ids[];
 
 extern int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd);
 extern int nand_update_bbt(struct mtd_info *mtd, loff_t offs);