[PATCH] libmtd: allow write operations when MEMWRITE is not supported

[Brian Norris <computersforpeace@gmail.com>]

MEMWRITE is a recently introduced write interface for MTD; however, it
is, for now, only supported on NAND flash. mtd-utils should fall back to
old write methods when either ENOTTY or EOPNOTSUPP are returned.

This is a showstopper when, for instance, using ubiformat on NOR, which
don't have a mtd->write_oob interface (and thus don't support MEMWRITE):

  ubiformat: formatting eraseblock 2 --  1 % complete  libmtd: error!: MEMWRITE ioctl failed for eraseblock 2 (mtd3)
          error 122 (Operation not supported)

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 lib/libmtd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/libmtd.c b/lib/libmtd.c
index 1b16de5..9b247ae 100644
--- a/lib/libmtd.c
+++ b/lib/libmtd.c
@@ -1151,7 +1151,7 @@ int mtd_write(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb,
 	ret = ioctl(fd, MEMWRITE, &ops);
 	if (ret == 0)
 		return 0;
-	else if (errno != ENOTTY)
+	else if (errno != ENOTTY && errno != EOPNOTSUPP)
 		return mtd_ioctl_error(mtd, eb, "MEMWRITE");
 
 	/* Fall back to old methods if necessary */
-- 
1.7.5.4