[PATCH v2 10/15] mtd: Add some fallbacks for add/del_mtd_device

[Sean Anderson]

This allows using these functions without ifdefs. OneNAND depends on MTD,
so this ifdef was redundant in the first place.

Signed-off-by: Sean Anderson <seanga2 at gmail.com>
Reviewed-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
---

(no changes since v1)

 drivers/mtd/nand/raw/nand.c         |  2 --
 drivers/mtd/onenand/onenand_uboot.c |  2 --
 include/linux/mtd/mtd.h             | 12 ++++++++++++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand.c b/drivers/mtd/nand/raw/nand.c
index 4da41438790..3abd82068fb 100644
--- a/drivers/mtd/nand/raw/nand.c
+++ b/drivers/mtd/nand/raw/nand.c
@@ -60,13 +60,11 @@ int nand_register(int devnum, struct mtd_info *mtd)
 	sprintf(dev_name[devnum], "nand%d", devnum);
 	mtd->name = dev_name[devnum];
 
-#ifdef CONFIG_MTD
 	/*
 	 * Add MTD device so that we can reference it later
 	 * via the mtdcore infrastructure (e.g. ubi).
 	 */
 	add_mtd_device(mtd);
-#endif
 
 	total_nand_size += mtd->size / 1024;
 
diff --git a/drivers/mtd/onenand/onenand_uboot.c b/drivers/mtd/onenand/onenand_uboot.c
index 04791df69bb..ecacabefadc 100644
--- a/drivers/mtd/onenand/onenand_uboot.c
+++ b/drivers/mtd/onenand/onenand_uboot.c
@@ -44,14 +44,12 @@ void onenand_init(void)
 			puts("Flex-");
 		puts("OneNAND: ");
 
-#ifdef CONFIG_MTD
 		/*
 		 * Add MTD device so that we can reference it later
 		 * via the mtdcore infrastructure (e.g. ubi).
 		 */
 		onenand_mtd.name = dev_name;
 		add_mtd_device(&onenand_mtd);
-#endif
 	}
 	print_size(onenand_chip.chipsize, "\n");
 }
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 09f52698877..7a66c7af749 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -552,8 +552,20 @@ unsigned mtd_mmap_capabilities(struct mtd_info *mtd);
 
 #ifdef __UBOOT__
 /* drivers/mtd/mtdcore.h */
+#if CONFIG_IS_ENABLED(MTD)
 int add_mtd_device(struct mtd_info *mtd);
 int del_mtd_device(struct mtd_info *mtd);
+#else
+static inline int add_mtd_device(struct mtd_info *mtd)
+{
+	return -ENOSYS;
+}
+
+static inline int del_mtd_device(struct mtd_info *mtd)
+{
+	return -ENOSYS;
+}
+#endif
 
 #ifdef CONFIG_MTD_PARTITIONS
 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
-- 
2.37.1