mtd: core: initialize *retlen in mtd_write()

Some mtd drivers like the spi-nor driver do not assign a value
to the retlen pointer but instead only add the bytes written
to *retlen. Users of mtd_write expect the variable to be initialized
by the mtd core though, so we have to do it in mtd_write(). The
same is done in mtd_read already.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mtd/core.c b/drivers/mtd/core.c
index d873369d5d..62307db709 100644
--- a/drivers/mtd/core.c
+++ b/drivers/mtd/core.c
@@ -340,6 +340,8 @@ int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 		const u_char *buf)
 {
+	*retlen = 0;
+
 	return mtd->write(mtd, to, len, retlen, buf);
 }