On Fri, 2018-03-02 at 09:50 +0100, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> ------------------
> From: Sascha Hauer <s.ha...@pengutronix.de>
> [ Upstream commit fdf2e821052958a114618a95ab18a300d0b080cb ]
> When erased subpages are read then the BCH decoder returns STATUS_ERASED
> if they are all empty, or STATUS_UNCORRECTABLE if there are bitflips.
> When there are bitflips, we have to set these bits again to show the
> upper layers a completely erased page. When a bitflip happens in the
> exact byte where the bad block marker is, then this byte is swapped
> with another byte in block_mark_swapping(). The correction code then
> detects a bitflip in another subpage and no longer corrects the bitflip
> where it really happens.

This seesm to be a bug fix for commit bd2e778c9ee3 "gpmi-nand: Handle
ECC Errors in erased pages".  That's not in 4.4 so the bug fix is not
needed, though it doesn't appear to do any harm.


Ben Hutchings
Software Developer, Codethink Ltd.

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