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-rw-r--r--drivers/mtd/onenand/onenand_base.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 56255c85d97..5d7965f7e9c 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;
}