1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 56255c85d97b..5d7965f7e9ce 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -329,6 +329,21 @@ static int onenand_wait(struct mtd_info *mtd, int state)
                 printk(KERN_ERR "onenand_wait: controller error = 0x%04x\n", ctrl);
                 if (ctrl & ONENAND_CTRL_LOCK)
                         printk(KERN_ERR "onenand_wait: it's locked error.\n");
+                if (state == FL_READING) {
+                        /*
+                         * A power loss while writing can result in a page
+                         * becoming unreadable.  When the device is mounted
+                         * again, reading that page gives controller errors.
+                         * Upper level software like JFFS2 treat -EIO as fatal,
+                         * refusing to mount at all.  That means it is necessary
+                         * to treat the error as an ECC error to allow recovery.
+                         * Note that typically in this case, the eraseblock can
+                         * still be erased and rewritten i.e. it has not become
+                         * a bad block.
+                         */
+                        mtd->ecc_stats.failed++;
+                        return -EBADMSG;
+                }
                 return -EIO;
         }