1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 45108ed85588..d5f24089be71 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -378,7 +378,9 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
 
                         spi_sync(flash->spi, &m);
 
-                        *retlen += m.actual_length - sizeof(flash->command);
+                        if (retlen)
+                                *retlen += m.actual_length
+                                        - sizeof(flash->command);
                 }
         }