[MTD] NAND Signal that a bitflip was corrected by ECC

[safe/jmp/linux-2.6] / drivers / mtd / mtdchar.c

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 7522fc3..a48210d 100644 (file)
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -199,10 +199,13 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
                /* Nand returns -EBADMSG on ecc errors, but it returns
                 * the data. For our userspace tools it is important
                 * to dump areas with ecc errors !
+                * For kernel internal usage it also might return -EUCLEAN
+                * to signal the caller that a bitflip has occured and has
+                * been corrected by the ECC algorithm.
                 * Userspace software which accesses NAND this way
                 * must be aware of the fact that it deals with NAND
                 */
-               if (!ret || (ret == -EBADMSG)) {
+               if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
                        *ppos += retlen;
                        if (copy_to_user(buf, kbuf, retlen)) {
                                kfree(kbuf);